Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c938494cadde409…

MALICIOUS

PDF

83.3 KB Created: 2021-04-21 20:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9c2dc21988064f509529303a7d7b36ba SHA-1: 44084b9be6a499ab821beff3c863e0276ba8c566 SHA-256: 6c938494cadde409b40281416f25e2f02ad05aa9d6cf86b2fa984c31db7bc60c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/strik?utm_term=chamberlain+liftmaster+professional+1+2+hp+sensor+light+not+working PDF link annotation
    • https://wumaluruporemad.weebly.com/uploads/1/3/0/9/130969386/lefodasedega_mewejababajit.pdfIn PDF document text
    • https://lenonexijinex.weebly.com/uploads/1/3/4/6/134647177/tiromepibivutixep.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/cieHhid/36089045905.pdfIn PDF document text
    • http://wdd13.ru/what_biome_do_komodo_dragons_live_inqw9ab.pdfIn PDF document text
    • https://gulapizebulo.weebly.com/uploads/1/3/1/0/131070336/f864daf7.pdfIn PDF document text
    • http://kartaidatodemeleri.com/juwulutoawxhd.pdfIn PDF document text
    • https://cdn.sqhk.co/wusirilunoko/QfRBAhb/60836557.pdfIn PDF document text
    • https://dufadijikog.weebly.com/uploads/1/3/5/3/135325035/6327558.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojiranat/N45MhfE/35189031987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408177/normal_601cbf676d91a.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvazuginu/yMxMwhe/8384806074.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493600/normal_604b3777e743c.pdfIn PDF document text
    • https://cdn.sqhk.co/zofonabiz/aYajche/zamiwuneparuzumexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461481/normal_600a3c84b7ea8.pdfIn PDF document text
    • https://cdn.sqhk.co/jepivitixiwo/hctBcjb/fast_food_restaurant_chef_apk.pdfIn PDF document text
    • http://getbuiss.online/mitagoxexarujopekohdh62.pdfIn PDF document text
    • http://gachihyper.xyz/hp_probook_4530s_i5_release_dateste6y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419849/normal_6041ea6a7a8a1.pdfIn PDF document text
    • https://rolafaxamowoti.weebly.com/uploads/1/3/4/9/134903079/4602716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_601cfe9bd940c.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/giffhaV/somer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://46c19374-600d-43be-a5f2-d8bf07c6fddf.filesusr.com/ugd/cc94a4_9bd1de030ea24578bb790f8d19e0d3a6.pdf?index=trueIn PDF document text
    • https://5984e891-aecd-43e6-866f-efdb297c9c35.filesusr.com/ugd/403565_c1f30504a83b4d88aba4f1d59cc0c5df.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_14775b7104dd40bdb3dcef0d6d94692f.pdf?index=trueIn PDF document text
    • https://e321b6f2-2a0a-4c58-8c60-26baf46d82f1.filesusr.com/ugd/14900c_2026581dee0a46c4be7022bb480f7a28.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_off00010647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10647 5700 bytes
SHA-256: c241708f67c2a508b19ccb8c3adce345906c697cc84f1d393ae3248482644e47
font_01_sfnt_off00011996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11996 10296 bytes
SHA-256: bdc9f4c5f875bbe14f1977c659390025a6104e776b70e2daf7a019c24a83821f