Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5183bfade2cfab7…

MALICIOUS

PDF

77.3 KB Created: 2021-04-16 16:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: de4765ccdd3fe150f300a512fc9217de SHA-1: b6ec4269df8064b0d73bdaa76a554afe83880b2d SHA-256: a5183bfade2cfab758b3c18669c4bc1d4314b5f8efc7242179d10732847f6046
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://resalured.ru/strik?utm_term=best+bait+for+saltwater+fishing+in+florida PDF link annotation
    • http://rujewazaxijaza.sportsontheweb.net/brain_death_criteria_2020.pdfIn PDF document text
    • https://razotipelemato.weebly.com/uploads/1/3/0/7/130738732/61186215e.pdfIn PDF document text
    • https://cdn.sqhk.co/wogefosa/ejigfjb/diy_arts_and_crafts_ideas_for_adults.pdfIn PDF document text
    • http://raraveluwogevuw.mypressonline.com/11415970840.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470523/normal_6035090a24f12.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/hgEkLic/cartoon_craft_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/menodotitit/hj5ji2e/14318524268.pdfIn PDF document text
    • https://nukusuruv.weebly.com/uploads/1/3/1/8/131857442/ff80bdc.pdfIn PDF document text
    • https://zojujevekuki.weebly.com/uploads/1/3/0/9/130969212/ropes-sopukibazafime-nesugopanesobi-tames.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450045/normal_5fdadbb011a47.pdfIn PDF document text
    • http://sovetnik53.ru/html_link_to_printtnzhd.pdfIn PDF document text
    • https://cdn.sqhk.co/zafowavo/eaSXjfu/kexubafazozotume.pdfIn PDF document text
    • https://jimekijan.weebly.com/uploads/1/3/2/8/132815057/09d769f.pdfIn PDF document text
    • https://nadusada.weebly.com/uploads/1/3/0/7/130740262/6952895.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/wozig.pdfIn PDF document text
    • http://taxevidel.medianewsonline.com/bug_out_kit_list.pdfIn PDF document text
    • http://gratoraama.website/zanetikusorigunigaj2x3ar.pdfIn PDF document text
    • http://ig-support-service.com/keep_talking_and_nobody_explodes_fro8rxh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/papuja/vedegiraduvaxofixazir.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/liwutukamozomojajux.pdfIn PDF document text
    • http://wadoromutisagar.myartsonline.com/34224026751.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_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 5452 bytes
SHA-256: c01e5037249b414c9db55f684239b8f450647ba657a822d28f9acacdb26148c1
font_01_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 10272 bytes
SHA-256: 9db494a112b5d33dc480de08fa7004078dcaa03816f52fd2d20b7a86e6215fa8

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