Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d91fc4c07b6e277…

MALICIOUS

PDF

79.0 KB Created: 2021-04-23 04:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a15830d711c2a37262de72c78cd424a2 SHA-1: ba9f5f4245cf0e946da0b243d7cf8d61bf1b7d77 SHA-256: 1d91fc4c07b6e27784f9325faadd9dfa21828bdb3bb9a56d5ceceec6c8662ecb
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links, many pointing to disposable hosting services. The primary URL, https://seumenha.ru/strik, is likely part of a redirection chain designed to lead the user to potentially harmful content or phishing sites. No scripts were extracted, but the PDF structure and link farm behavior suggest it's used to distribute or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/strik?utm_term=a+neural+network+machine+learning+model PDF link annotation
    • https://fadexawotizetav.weebly.com/uploads/1/3/4/3/134339615/kixolewemevidevuvawu.pdfIn PDF document text
    • https://winozijatefazo.weebly.com/uploads/1/3/5/3/135327399/fagegejerijemefek.pdfIn PDF document text
    • https://bapizemu.weebly.com/uploads/1/3/1/1/131163962/a8bedbf0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_6023bfb0b4fe3.pdfIn PDF document text
    • https://narufana.weebly.com/uploads/1/3/4/6/134653256/faguzexoketeg_mofosepupavip.pdfIn PDF document text
    • https://naketutetan.weebly.com/uploads/1/3/4/6/134660231/fakixifun-vogijas.pdfIn PDF document text
    • https://selilanabos.weebly.com/uploads/1/3/4/8/134875664/4097144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424953/normal_601fcbe550d7e.pdfIn PDF document text
    • https://lorotemorotur.weebly.com/uploads/1/3/4/6/134649447/vigurififazebomo.pdfIn PDF document text
    • https://memibufosigi.weebly.com/uploads/1/3/1/3/131383384/4904875.pdfIn PDF document text
    • https://zevoxonigex.weebly.com/uploads/1/3/5/3/135300088/fasuzorunidejilapo.pdfIn PDF document text
    • https://vufevilasok.weebly.com/uploads/1/3/4/3/134314299/1483752.pdfIn PDF document text
    • https://wopulatizu.weebly.com/uploads/1/3/4/3/134348797/4d24ee21.pdfIn PDF document text
    • https://fawewetipe.weebly.com/uploads/1/3/1/3/131379545/wutofegabegu_dixudosob.pdfIn PDF document text
    • http://oblakova.ru/7421346875af51m.pdfIn PDF document text
    • https://rafowatixi.weebly.com/uploads/1/3/0/8/130874563/joxobiwoz.pdfIn PDF document text
    • https://palujaburufo.weebly.com/uploads/1/3/2/7/132740236/kasexuwifeze_nuxola_dewexuto.pdfIn PDF document text
    • http://salopkisa.website/788790734164sqa9.pdfIn PDF document text
    • http://cardio-natural.info/marine_safety_center_ballast_water5hy35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wosotufozutula.epizy.com/can_you_get_big_with_just_bodyweight_exercises.pdfIn PDF document text
    • http://kudomik.rf.gd/64727033162.pdfIn PDF document text
    • http://bumilamufitilu.epizy.com/88117951387.pdfIn PDF document text
    • http://tulazupuvive.epizy.com/84341545950.pdfIn PDF document text
    • http://kimejuj.rf.gd/python_tutorial_for_beginners_full_python_programming_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_off0000f549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF549 5320 bytes
SHA-256: 324c90b1984aefba09d43751654d2cb9906198224df146e341880489c993bf7c
font_01_sfnt_off00010741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10741 10928 bytes
SHA-256: bbd06d871b0442c27b11a9fd01588de270f631f5b8566b188f5a5c62215df1cd