Malicious PDF — malware analysis report

Static analysis result for SHA-256 331cb16e3ecae347…

MALICIOUS

PDF

107.2 KB Created: 2021-04-05 03:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: df50d5b1adea681005468f2395aa951e SHA-1: e7c325af8ac2c75aaf527069255f11b7978511e1 SHA-256: 331cb16e3ecae34738e33d05ae846ad5b3b9b78557e3868174f452d1a0039f73
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a large PDF link farm, with many external URIs pointing to disposable hosting and potentially malicious content, suggests a phishing or malware distribution scheme. The document's structure and numerous external links are indicative of an attempt to lure users to compromised or malicious sites.

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://kuzutuzo.ru/strik?utm_term=black+diamond+icon+headlamp+replacement+strap PDF link annotation
    • https://cdn.sqhk.co/xefijumu/jjhbcFS/9pm_football_managers_y_lmaz_vural_apk.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/lujafivomiju-wofabina-bipemase-xopovas.pdfIn PDF document text
    • https://xebeluxowupud.weebly.com/uploads/1/3/1/3/131384709/ralulamomibof_rupogozoditib.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/hjiezfF/bazeva.pdfIn PDF document text
    • https://cdn.sqhk.co/pimupigedu/gdhjUoY/anime_girl_voice_changer_for_discord.pdfIn PDF document text
    • https://surevasod.weebly.com/uploads/1/3/1/8/131856145/8646378.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/a83babc14b82c7e.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/dzAAgi6/vubefemazakojizeloxi.pdfIn PDF document text
    • https://zunexoxefa.weebly.com/uploads/1/3/5/3/135340588/tepukoxaminiziz.pdfIn PDF document text
    • https://nepuvaduwixoki.weebly.com/uploads/1/3/4/5/134525355/27af02bd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379611/normal_5fd054fc0bc00.pdfIn PDF document text
    • https://fologonalufofu.weebly.com/uploads/1/3/4/6/134694067/218978.pdfIn PDF document text
    • https://mufamemibota.weebly.com/uploads/1/3/1/8/131856380/1296698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415929/normal_6035e5b86bd8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470532/normal_602eb91c86c77.pdfIn PDF document text
    • https://vumizopefi.weebly.com/uploads/1/3/5/3/135313358/rikadubanogoduzuk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_a89728bb001c47828a3cde6bfa4d5b65.pdf?index=trueIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_e6258d8e413d42aaaacbc19103fa8160.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_off0001646e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1646E 5428 bytes
SHA-256: 0fc6b606897170b8638be458388a22db3776d9c3305209649edd6397bb8db96e
font_01_sfnt_off000176b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176B4 11944 bytes
SHA-256: e145e70aeb58fdb01b5489e254fbe06e6248e3ad7e9c250482b009d4456e210c

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