Malicious PDF — malware analysis report

Static analysis result for SHA-256 12041cd70e83aef2…

MALICIOUS

PDF

77.9 KB Created: 2021-03-20 22:19:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 228823261c5a10dec5ad376096fa5792 SHA-1: b4b5f930f3e25261d998842a182a9df398d1503a SHA-256: 12041cd70e83aef2f3584741893768f67e32c83b8d87178eeaa21fdf335e8953
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO spamming operation. The primary URL, 'https://dafemum.ru/wix?keyword=tdcj+background+check', indicates a lure related to background checks. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://dafemum.ru/wix?keyword=tdcj+background+check
    • https://vufosaxirit.weebly.com/uploads/1/3/4/0/134018891/5656820.pdf
    • https://vebafuxitupum.weebly.com/uploads/1/3/4/8/134890404/708546.pdf
    • https://cdn.sqhk.co/nadetajagupe/jcpVQWH/preschool_learning_fun_songs.pdf
    • https://titepusigob.weebly.com/uploads/1/3/5/3/135392267/wuxotazibajujim.pdf
    • https://cdn.sqhk.co/sefedetorup/gcQihia/globe_rewards_app_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4380539/normal_600d28d734032.pdf
    • https://cdn-cms.f-static.net/uploads/4462688/normal_604bb7838ddb2.pdf
    • https://jibogikufojubu.weebly.com/uploads/1/3/1/4/131438018/subakatadiwuv.pdf
    • https://cdn.sqhk.co/kiribikiv/gAhjrje/dragon_shooting_survival_games.pdf
    • https://cdn.sqhk.co/gopuxipo/jegfjiB/77563604986.pdf
    • http://siwosupegejolop.medianewsonline.com/68007723285.pdf
    • https://cdn.sqhk.co/ninivaxibab/jexibjd/full_movie_website_for_mobile.pdf
    • http://rexonina.medianewsonline.com/bernina_1230_features.pdf
    • https://lutafutenitar.weebly.com/uploads/1/3/4/3/134381418/gatogafibeguzi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rufonali/wusexibanug.pdf
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_150501d468594af3a86eadb48c675331.pdf?index=true
    • https://s3.amazonaws.com/kotodur/74617544899.pdf
    • http://zotubune.myartsonline.com/baxugowejarizexi.pdf
    • http://pabotojixupi.atwebpages.com/behavioral_theory_of_smoking.pdf
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_4a89214fab0f4e1b8324ef4e8777eff5.pdf?index=true
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_4f1f01e582714ba6b3a1f8c575168946.pdf?index=true
    • https://s3.amazonaws.com/bovenotojitowe/minecraft_java_edition_1._14_for_free.pdf
    • https://4f6c49ad-35c2-4e1b-a50e-a4ca4816ee30.filesusr.com/ugd/a28dad_c0d5d2d4d96445d68d59c3056f2276d3.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f240.bin
6887746758d000aba76b30c1511592949d59a47586db1676cbe6be4aa102c0f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF240 5220 bytes
font_01_sfnt_off00010404.bin
6ac04f7914cedc443be85dee25e4aed450b15046b5fb26bf1c39536179cf3f55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 10728 bytes

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