Malicious PDF — malware analysis report

Static analysis result for SHA-256 8188bd5c8a084b06…

MALICIOUS

PDF

91.8 KB Created: 2021-04-05 03:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c1a445b4980591a08c3ed8af3812c8b0 SHA-1: a7e8c8b50a2c30e9f5c860bf19e63be2340dc701 SHA-256: 8188bd5c8a084b063d41fb1393a8bf2fad1216f675c1e0dde88d1a3219b44de6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links pointing to various domains, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. The presence of numerous external links, many on disposable hosting, supports the attack pattern of distributing or redirecting to potentially harmful content.

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://gimoguvi.ru/123?utm_term=b+format+paperback+margins PDF link annotation
    • http://pagavopalubutu.scienceontheweb.net/movies_like_jack_reacher_never_go_back.pdfIn PDF document text
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/410283.pdfIn PDF document text
    • http://wusumomijo.medianewsonline.com/subject_verb_agreement_worksheet_3rd_grade.pdfIn PDF document text
    • https://kowasazupajobex.weebly.com/uploads/1/3/1/3/131383373/tulijazap.pdfIn PDF document text
    • https://gavozosalaz.weebly.com/uploads/1/3/1/1/131163920/15485004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448731/normal_6064cdac21ce1.pdfIn PDF document text
    • https://baxemazone.weebly.com/uploads/1/3/0/7/130739829/f5152a2f73c8.pdfIn PDF document text
    • https://gejiwafut.weebly.com/uploads/1/3/2/6/132683005/57798f.pdfIn PDF document text
    • http://vivubowi.getenjoyment.net/sajomikusupibitofun.pdfIn PDF document text
    • https://fuxogadukuka.weebly.com/uploads/1/3/4/6/134688721/2098058.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501045/normal_5ff9670bd498f.pdfIn PDF document text
    • http://dokakepitizix.medianewsonline.com/what_information_do_safety_data_sheets_contain.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495409/normal_603d358a829ec.pdfIn PDF document text
    • http://favarivizuna.medianewsonline.com/59321894488.pdfIn PDF document text
    • https://wadazujirala.weebly.com/uploads/1/3/4/5/134596454/niwinurene_suxexotilogof_bepewimus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489411/normal_602d3885aa6e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_604105aa19277.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460677/normal_5fe991dbf33a9.pdfIn PDF document text
    • https://todijaxazifaro.weebly.com/uploads/1/3/4/3/134342800/78f03.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F6 5556 bytes
SHA-256: c767fc63f62383e3b29e8216f20c951f81edfc71763ba4c6ba6a9529a72c57ed
font_01_sfnt_off000138cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CB 12592 bytes
SHA-256: 2507e4c451f7dcab66d33851644636af639d6aca58e48424e2c5640e4d897153

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