Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f077541c897b5d…

MALICIOUS

PDF

88.0 KB Created: 2021-04-02 07:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 026dc0b31b44f9651bd81a8c48a19200 SHA-1: 24d702bfdf59ead358f114794f48c4685dd948ec SHA-256: a6f077541c897b5de068adeaa4458f8243ccde614550c9ee891d4754a8f0c8a1
244 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. It contains a large number of external links, forming a link farm hosted on disposable domains, which is a common tactic for SEO poisoning and phishing. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely serves as a lure to 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/strik?utm_term=how+to+draw+a+face+from+side+view In PDF document text
    • https://nutomejeti.weebly.com/uploads/1/3/4/7/134702699/2687954.pdfIn PDF document text
    • https://wexarasi.weebly.com/uploads/1/3/4/3/134351888/bopowirapodabon_vovazez.pdfIn PDF document text
    • https://koreperuk.weebly.com/uploads/1/3/2/6/132680900/xulegit_nilarer_kuwubep_duzaxil.pdfIn PDF document text
    • http://prequester.online/zombie_vs_fruit_plants_2vnx0w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443576/normal_60240fed5a1bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453556/normal_606666f6304e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_606680ee08ac9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410988/normal_6036995e7806b.pdfIn PDF document text
    • https://zitujizu.weebly.com/uploads/1/3/4/7/134731650/e32644.pdfIn PDF document text
    • https://xebuzoxovekig.weebly.com/uploads/1/3/4/0/134018553/jitukolowe.pdfIn PDF document text
    • https://zasosefudasu.weebly.com/uploads/1/3/1/8/131856937/5096606.pdfIn PDF document text
    • http://prodson.fun/how_to_reprogram_my_ge_universal_remotea3rt4.pdfIn PDF document text
    • https://nifilova.weebly.com/uploads/1/3/0/7/130740060/winig_levosanajipuj_wuwebaduduto.pdfIn PDF document text
    • https://budojidotepaso.weebly.com/uploads/1/3/5/3/135312143/laban_guvokafonizego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492529/normal_601efa4844f8e.pdfIn PDF document text
    • https://nolelagisumo.weebly.com/uploads/1/3/4/1/134132353/6067578.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xesesezaxemu.epizy.com/8179405433.pdfIn PDF document text
    • http://xuxuxal.epizy.com/typical_medical_school_interview_questions_and_answers.pdfIn PDF document text
    • http://divakupi.rf.gd/q_es_clulas_falciformes.pdfIn PDF document text
    • http://vokotikif.epizy.com/learn_chinese_online_best_course.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_off00011d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D29 5248 bytes
SHA-256: fb6aae29860fbcb424503f2eb36a1161acdf8eb7336ea9d01d9b9dee0cf4c29a
font_01_sfnt_off00012f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F01 10552 bytes
SHA-256: 81e3af746f2890e027406033c9d6ba4feaf3264a7bf5e57c9cdac6b03f7129d4