Malicious PDF — malware analysis report

Static analysis result for SHA-256 b855a15ba6b98235…

MALICIOUS

PDF

90.1 KB Created: 2021-03-22 14:49:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 93d4f324c978a4eefd91f24779202895 SHA-1: 8a0c868c1cf9742ba33cd6f96184878afefc3699 SHA-256: b855a15ba6b98235f2c570faf2c7e9498c4bd2506a0247fc865b905e7aebedb8
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://dugedepap.ru/wix?keyword=reach+for+the+stars+science+olympiad+sample+test PDF link annotation
    • http://setugolufifoju.iblogger.org/7_month_old_milestones_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/yjfNCid/best_magic_mods_skyrim_ps4.pdfIn PDF document text
    • http://lifeshop.pro/712850938695pqfd.pdfIn PDF document text
    • https://cdn.sqhk.co/dexijonur/hkjaqhj/copyright_free_sound_effects_for_youtube_videos.pdfIn PDF document text
    • http://gaydating.world/bridge_constructor_free_ios4d5vj.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/xid1hge/find_my_friends_phone_tracker_review.pdfIn PDF document text
    • https://cdn.sqhk.co/bizujutenifo/haxZBjd/thora_birch_walking_dead_character.pdfIn PDF document text
    • http://idealslimitaly-ufficiale.site/baby_grand_piano_covers_uk7ds82.pdfIn PDF document text
    • http://irisca.online/30275944535nm6n5.pdfIn PDF document text
    • http://bobiruropiles.22web.org/caaspp_practice_test_6th_grade.pdfIn PDF document text
    • http://card2card.live/36113488678y3mv7.pdfIn PDF document text
    • http://woxupepij.iblogger.org/83339904341.pdfIn PDF document text
    • https://cdn.sqhk.co/gefizorabubi/hjb7hb5/wikidu.pdfIn PDF document text
    • http://ideal-it.fun/98757823872dstxk.pdfIn PDF document text
    • http://servisvds.ru/47383234017iw89.pdfIn PDF document text
    • http://teachost.com/bewotefapudonoob9ol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sujutesar.rf.gd/fybsc_botany_textbook.pdfIn PDF document text
    • http://lajofekozorofa.rf.gd/jabuxagoronenumujina.pdfIn PDF document text
    • http://lajoxugulip.epizy.com/does_taco_bell_serve_their_full_menu_all_day.pdfIn PDF document text
    • http://zitupelu.epizy.com/all_american_pressure_canner_915_manual.pdfIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_d488e05e50734c7fbd978f8beab89921.pdf?index=trueIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_1e96395521f7466c80001ed1487800cd.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C10 5504 bytes
SHA-256: 639029d23e088d3aa50c2d4866255672a22353ba7cd350cda4c91ccfa5a9f814
font_01_sfnt_off00011eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 11264 bytes
SHA-256: f10b05a0953c8ab290e99550ec2f8d4bc2e2a346bb3f09cea97cd32f177a2f05
font_02_sfnt_off00014567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14567 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449