Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75a3f787bfa893e…

MALICIOUS

PDF

85.7 KB Created: 2021-02-25 02:45:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5adf9cf709bfaa702de4bf98dc0b07f1 SHA-1: b20ccb4606861f1a7cdc0a6ab7361b3346a7bf5e SHA-256: f75a3f787bfa893e4748ec5cc4b18626366a364aa83c094b42740e65fa41f269
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and does not provide clear instructions, but the presence of numerous external URLs points to a distribution or redirection mechanism.

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://bologen.ru/wix?keyword=florida+unschoolers+deschooling PDF link annotation
    • https://mibofadap.weebly.com/uploads/1/3/1/6/131637701/1eb89cfb49985.pdfIn PDF document text
    • https://gipofomodofomew.weebly.com/uploads/1/3/2/3/132303323/ce0bf1ad.pdfIn PDF document text
    • http://jakartapro.xyz/direct_and_reported_speech_exercises_onlineshm89.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/UddeJie/72025968681.pdfIn PDF document text
    • https://cdn.sqhk.co/zafazegig/h1ehixx/48653105952.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/806576681450fmmx.pdfIn PDF document text
    • http://aycotoro0.xyz/arma_3_altis_life_rebel_guidexowi8.pdfIn PDF document text
    • https://cdn.sqhk.co/ronofumito/5LizIs5/babininazudefumagupa.pdfIn PDF document text
    • https://sibujoxosuzeru.weebly.com/uploads/1/3/4/4/134499285/mobisejuvusonuwubiwo.pdfIn PDF document text
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/1c2b598681.pdfIn PDF document text
    • https://cdn.sqhk.co/sojuzafu/E5hegdb/lojofakonulimowixalat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xumerapugegivo.epizy.com/53666621603.pdfIn PDF document text
    • http://nokemufebevezo.rf.gd/53989195853.pdfIn PDF document text
    • http://suzujikuluvujov.rf.gd/64907275190.pdfIn PDF document text
    • http://wipapirub.epizy.com/21036925672.pdfIn PDF document text
    • http://wuwomuwudawim.epizy.com/resume_templates_google_docs.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_off00011545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11545 5156 bytes
SHA-256: ce04f72e6dca83f224db9b1477a762e142dbe14c4f4a5661ca5e9e1d44b0d404
font_01_sfnt_off000126c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C4 10192 bytes
SHA-256: 7db07d0e43a5868f5ce67517f6dcd30f5ce709dc748c788668a12e60c291d88b

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