Malicious PDF — malware analysis report

Static analysis result for SHA-256 39080fa21717bee9…

MALICIOUS

PDF

89.7 KB Created: 2021-03-31 14:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6b0d23938302fa297b48a2da62171e95 SHA-1: 28ebf6e9bb66e3dda657dd7a22597417646dcb78 SHA-256: 39080fa21717bee999cf1d35db7e749fa9230dae7ad8f883237e2a5595e25af9
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating it's designed to redirect users to malicious infrastructure. The embedded links, such as 'https://yafferge.ru/wix?keyword=amlogic+tv+launcher+apk', are part of a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/wix?keyword=amlogic+tv+launcher+apk In PDF document text
    • https://cdn.sqhk.co/lexoxuxoluvi/iihdJhi/xiraf.pdfIn PDF document text
    • https://cdn.sqhk.co/kubasovusi/hcn9hjM/age_of_world_wars.pdfIn PDF document text
    • https://cdn.sqhk.co/kufomopinu/nhdgiLs/best_boss_fighting_games_ps3.pdfIn PDF document text
    • https://cdn.sqhk.co/mogidamiko/iSgdjdG/emergency_alerts_iphone_settings.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mesepojo.rf.gd/27287664866.pdfIn PDF document text
    • http://vejawojifig.epizy.com/a_midsummer_nights_dream_translation_to_modern_english.pdfIn PDF document text
    • http://duvewukabiwetu.epizy.com/kesazunezaxazabekusafa.pdfIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_cf9b2f30c2af4d31a00d24dd7b018545.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/zakojufakozepizomekuxi.pdfIn PDF document text
    • http://poxaxedezof.epizy.com/tenosajeno.pdfIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_06ef20c418404a6ba712064bf7637435.pdf?index=trueIn PDF document text
    • http://dilakibuj.rf.gd/anna_university_aeronautical_engineering_syllabus_regulation_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0198f374-5215-44e3-8dc5-af6090fb438c/bryant_plus_90i_blower_motor.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/91139548773.pdfIn PDF document text
    • http://bopanexogu.epizy.com/48965334938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f23cd3-fb17-46e5-9eeb-31b5d66483fe/elearning_storyboard_template_ppt.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_f004518ace514749905c4e277556ec93.pdf?index=trueIn PDF document text
    • http://ribidur.epizy.com/dynamics_of_machinery_airwalk.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/felsons_principles_of_chest_roentgenology_4th_edition_download.pdfIn PDF document text
    • http://joriboka.epizy.com/lusugituvobar.pdfIn PDF document text
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_5622bbd449254fc0a3c116d801699629.pdf?index=trueIn PDF document text
    • http://bumojomoso.rf.gd/37531506816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c540b0f-d434-48ce-af41-83d0cb53a8a0/it_essentials_ite_v6.0__v7.0_chapter_8_exam_answers_100.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/yugioh_duel_links_starter_guide_reddit.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E6 3136 bytes
SHA-256: 95b8098a4042feaabcbc2eb97379a5d053fb975780bc29df41deb7d226d425c1
font_01_sfnt_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 5284 bytes
SHA-256: cb44a08600721a80fad56665fcae19e9db39913eb4f074e89c16da9b3ad7699c
font_02_sfnt_off0000f3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 6340 bytes
SHA-256: 9159c3bbe4e617fc6ab21800076b31c718e0e83db4142b903295bba04c9b58a9
font_03_sfnt_off00010335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10335 6980 bytes
SHA-256: 40b57cb8a0ee5fdeb3a02e204c610ae8120b84e5f622f54be7b48ed62f75f573
font_04_sfnt_off0001186c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186C 11404 bytes
SHA-256: d4a8f28a7be8725b4e6b1eef836ccd49a58c634a2f7fec3f0deed10732d510b9
font_05_sfnt_off00013dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCE 16984 bytes
SHA-256: d1b4a1c616c735656730e7d378f4dc0489784d62754d41427b2f91aaa75b86cd

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