Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8729080db6cb75…

MALICIOUS

PDF

78.8 KB Created: 2021-04-03 00:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e5d57cbf61655cabe07371f494338148 SHA-1: 53160d8ea8d0e003e01f18fdce421223945ff6d8 SHA-256: 4c8729080db6cb75a0520aee5de1ef1e486fe3b6c5dfdcc3e5ad2b1390814eae
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9957

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
  • 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://kuzutuzo.ru/wix?keyword=softmod+wii+2020 PDF link annotation
    • http://novugatep.22web.org/answer_to_job_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wowebajix/j9ijieD/duraboteziwonisawo.pdfIn PDF document text
    • https://cdn.sqhk.co/pifitudebuxo/gEchfjh/barosutakuvinufulomag.pdfIn PDF document text
    • http://duwadomet.22web.org/jual_honda_civic_2015_manual.pdfIn PDF document text
    • http://xuponigivixi.66ghz.com/mezerejoripetidunol.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/jcdeiiH/1601734504.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/DijgiOs/18014489339.pdfIn PDF document text
    • http://fotogodopuxet.iblogger.org/76239602844.pdfIn PDF document text
    • https://wusatotaluvak.weebly.com/uploads/1/3/4/4/134469206/8023694.pdfIn PDF document text
    • https://vigoruso.weebly.com/uploads/1/3/4/1/134131386/vudubupigo-dixiwowan-bedipezoneja-zizufugagonulig.pdfIn PDF document text
    • http://somenem.iblogger.org/average_velocity_problems_worksheet_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/eFEuq6f/17729352122.pdfIn PDF document text
    • https://mulodunewumil.weebly.com/uploads/1/3/4/3/134314444/e22d64f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dijiwag.epizy.com/contest_rules_template_free.pdfIn PDF document text
    • http://fepesori.rf.gd/how_to_replace_ink_on_canon_mx490.pdfIn PDF document text
    • http://lukuvisebexa.epizy.com/no_excuses_the_power_of_self_discipline_brian_tracy.pdfIn PDF document text
    • http://wetovokerug.epizy.com/82880103594.pdfIn PDF document text
    • http://megokog.epizy.com/craftsman_16_gallon_wet_dry_vac_manual.pdfIn PDF document text
    • http://zozasozam.epizy.com/abordagens_psicolgicas.pdfIn PDF document text
    • http://xizokokov.epizy.com/dulujuva.pdfIn PDF document text
    • http://mironowagiseb.rf.gd/13157330185.pdfIn PDF document text
    • http://fizebozemugi.epizy.com/folazetajubowotejo.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/zoteliweju.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/simple_addition_worksheets_for_kindergarten_with_pictures.pdfIn PDF document text
    • http://boxomivesamazi.epizy.com/convert_java_to_kotlin_android_studio_shortcuts.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/get_the_guy_book_review.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/free_live_tv_apps_for_pc.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 5008 bytes
SHA-256: 83248514fdcde442814da2046706f30c29ab7afcb19c0a45fb102a3ce7126b56
font_01_sfnt_off00010363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10363 12528 bytes
SHA-256: ae3fcc920a3f6d0e4d1588a32aad50ed64547717ee54a7ba60bfa56900b08157

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