Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1925f9881a1c6a…

MALICIOUS

PDF

96.6 KB Created: 2021-01-23 23:44:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 656e69c49724efbdbae4bb69b5405f77 SHA-1: 2715c376aaee8d4d3892c8dd11e87ab03794a586 SHA-256: cd1925f9881a1c6a781ba9a85833cb881c3c0affeddaf801b678425a522b1d2f
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The embedded URLs and the document body, though obfuscated, suggest a lure to external malicious sites. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffi.ru/123?utm_term=que+es+el+perimetro+de+un+poligono+regular PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365563/normal_5fd3a121c71b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391925/normal_5fe6968e13576.pdfIn PDF document text
    • https://site-1175916.mozfiles.com/files/1175916/cholamandalam_finance_claim_form.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5fdd30e924bd3.pdfIn PDF document text
    • https://site-1178037.mozfiles.com/files/1178037/feruporakejukopifumo.pdfIn PDF document text
    • https://site-1173223.mozfiles.com/files/1173223/58951626160.pdfIn PDF document text
    • https://cdn.sqhk.co/nivuduful/xjauheo/xisanefili.pdfIn PDF document text
    • https://site-1195484.mozfiles.com/files/1195484/87615040869.pdfIn PDF document text
    • https://cdn.sqhk.co/xederebat/1ifPgih/monster_bash_pinball_for_sale_australia.pdfIn PDF document text
    • https://pejudipevunasu.weebly.com/uploads/1/3/5/3/135351173/9dc328.pdfIn PDF document text
    • https://site-1175310.mozfiles.com/files/1175310/bodugelabazi.pdfIn PDF document text
    • https://tiforunu.weebly.com/uploads/1/3/1/4/131437018/zijujexelobavu_gizixo_sokijomevuto.pdfIn PDF document text
    • https://lapedegino.weebly.com/uploads/1/3/4/6/134689006/betugutipigejo-rinuda.pdfIn PDF document text
    • https://tigigedilopufam.weebly.com/uploads/1/3/5/4/135400960/sowibizabiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_5fd8f7fdd77ec.pdfIn PDF document text
    • https://site-1174886.mozfiles.com/files/1174886/34435713192.pdfIn PDF document text
    • https://site-1176572.mozfiles.com/files/1176572/bhojpuri_video_gana_mp4_2018.pdfIn PDF document text
    • https://site-1168209.mozfiles.com/files/1168209/41914357183.pdfIn PDF document text
    • https://cdn.sqhk.co/jegivoziba/U8Qghhj/mivemaki.pdfIn PDF document text
    • https://jerigarapo.weebly.com/uploads/1/3/5/3/135327201/nuvuweguf-sozonuraga-xivepef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014587.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14587 25772 bytes
SHA-256: 935c87b73704a3e23fd1b8ed5725774baca0938aed0b59c3df939774269ec433
font_00_sfnt_off00010899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10899 5340 bytes
SHA-256: db1e8209526fbf5a3732d41089e11e5bc40f568b1f11cc3cf0a213582ca12acf
font_01_sfnt_off00011aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA7 12992 bytes
SHA-256: 27f8d7b2a4e7b4e2e1df91a4a84fb942ffa6d01b0364095b83a93761ac5a6031