Malicious PDF — malware analysis report

Static analysis result for SHA-256 80fe3b2cbfe755db…

MALICIOUS

PDF

78.1 KB Created: 2021-03-16 13:02:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1e9d1645b3d978f1231aae35d78ff658 SHA-1: 9518f91842fcb1d1e4ae922c333bd6db4d49146b SHA-256: 80fe3b2cbfe755dbbf8baad7e9f8ec4eaee2ce5a970d8e5f4d03c7a119012a50
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 6

  • 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 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://nipisod.ru/award?keyword=guide+pisciculture+pdf PDF link annotation
    • https://cdn.sqhk.co/jimumakevaji/cR5ijpV/banupogorukuxekuvega.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/esYgiig/art_of_war_movie_chinese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_6015ddb8e7234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445869/normal_60465dd6c6c1d.pdfIn PDF document text
    • https://bixowupe.weebly.com/uploads/1/3/1/4/131409305/7149561.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473064/normal_602d9fe393bb0.pdfIn PDF document text
    • https://cdn.sqhk.co/pabilere/jDHghsw/how_to_go_viral_on_tiktok_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/purorelaz/3pjjibM/sengoku_basara_2_heroes_guide.pdfIn PDF document text
    • https://biwurozijusuxux.weebly.com/uploads/1/3/4/7/134724143/6241505.pdfIn PDF document text
    • https://cdn.sqhk.co/maweveju/djbifRL/sakobajuxuz.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/jjidzji/manososimasufoderuritasiw.pdfIn PDF document text
    • https://kuxijixa.weebly.com/uploads/1/3/4/8/134856984/539534.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458137/normal_5fed4c6d4f896.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/47caba83-f046-4327-a8fc-00a66b3cc935/36946848364.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc4307c3-20dd-4796-987f-d376755aa889/shark_sc630_portable_steam_pocket_handheld_steam_cleaner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac232412-efec-4a05-9c3c-8e97f0769236/how_much_does_a_fisher_wood_stove_weight.pdfIn PDF document text
    • https://c78267de-509c-4cb0-9394-6b21b7876e04.filesusr.com/ugd/290ce3_6fe17f60d685491e8990b49b45a526a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/011f8044-d277-4fc4-8e8b-0f4fa5be32ce/what_is_a_hallmark_hall_of_fame_movie.pdfIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_cc5a9c2d89ce402a9a2aaf98b417d946.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF511 4968 bytes
SHA-256: 6732bdaf85667bc600ac40bdc3a4dd6e025e29569edce410a6bdac005e839e5f
font_01_sfnt_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 10408 bytes
SHA-256: 4fb78bceebea4d7bf7d5b1f730466c9b76a4a6d24c64ecb64687cd31ac905c83

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