Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9e9e7cfb913a95…

MALICIOUS

PDF

72.5 KB Created: 2021-04-01 11:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2079b30d2d7882fbd791bbe9e4050edd SHA-1: b31741a98db7b4bc92bd0a839f807095c1458d64 SHA-256: 6b9e9e7cfb913a95d370fb16260146c1c57a6730b992c8cba06c1ff0ec867209
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://lozipotod.ru/award?keyword=bartender+software+manual+pdf PDF link annotation
    • http://gonojokolekovo.22web.org/planet_fitness_free_summer_membership_for_students.pdfIn PDF document text
    • http://tejifepubodol.iblogger.org/fasopapukegadebologepog.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/godapulemigexa.pdfIn PDF document text
    • http://rkconstructionsucks.com/jidebikisolupead3e.pdfIn PDF document text
    • http://retys.space/18916954807zrtwd.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/sigegirakik.pdfIn PDF document text
    • http://songkfrk.site/what_are_the_rules_of_basketball_todaygozuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fetevatakipip.epizy.com/classroom_language_list.pdfIn PDF document text
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_79d44ba957ba4978ad9a0d273bc9892f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/820e9e7c-320c-4e85-96c8-61f448b55e5d/12160965021.pdfIn PDF document text
    • https://acaa17bf-cf2e-4132-a9e9-810271eb8bc4.filesusr.com/ugd/ab5b4c_7584a18e9294498a9db9566b692ed9ce.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_673cc67e80c449c1b9483c57b35565a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0fb0fa-585f-4209-bef8-880ef37e5445/sukhmani_sahib_damdami_taksal.pdfIn PDF document text
    • http://kidaxuv.epizy.com/calvinism_in_the_protestant_reformation.pdfIn PDF document text
    • http://xukutiwap.epizy.com/42639971686.pdfIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_94edbba8ed9d4815adc5752d8d13a1de.pdf?index=trueIn PDF document text
    • http://popofisofol.myartsonline.com/how_to_become_a_sports_nutritionist_uk.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_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 5328 bytes
SHA-256: 8e182864899fecfdd8a5167fd5ae0e61c512cea2f1e3a9ff22df2cd1085bbd0c
font_01_sfnt_off0000f19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19B 10052 bytes
SHA-256: 04ca50cddf23d4fc03b3fca4a1f558b8fe30648c370454afb3233168f499a06f

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