Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1a742031412faf…

MALICIOUS

PDF

78.1 KB Created: 2021-03-17 21:54:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 3e821113413fe6c3c04d6137fe5d0aab SHA-1: 59ce6adaea11b1fccd1266296a329047fa834260 SHA-256: 5e1a742031412fafdfadba5f77fe67dacfdf7086d53f5bd51b143762df218fc4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous external URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attack pattern focused on redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/123?utm_term=satan+bite+the+dust+lyrics+pdf PDF link annotation
    • https://mepagalupotope.weebly.com/uploads/1/3/4/2/134265457/5386094.pdfIn PDF document text
    • https://fuzedefona.weebly.com/uploads/1/3/4/5/134578490/3aebd18925d3a.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/tonikipajazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446280/normal_604e3487ef5eb.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/547af1a9b2ed8b.pdfIn PDF document text
    • https://nebobaxewakizix.weebly.com/uploads/1/3/1/6/131637309/947358a2b5a730.pdfIn PDF document text
    • https://lefiligirer.weebly.com/uploads/1/3/4/7/134709268/mugorizoweg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485301/normal_5ffabeee975e8.pdfIn PDF document text
    • https://cdn.sqhk.co/wofazexej/aiRTQhc/tobovujilijopo.pdfIn PDF document text
    • https://xelavizagak.weebly.com/uploads/1/3/5/3/135325118/5e1adcb58873bb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460680/normal_6046e4357f1cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479235/normal_6036c5608c8a0.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/qhQUkgj/pivebuduxegos.pdfIn PDF document text
    • https://natesikapepik.weebly.com/uploads/1/3/4/7/134750077/4675c57ddbfc0b8.pdfIn PDF document text
    • https://parixaxagutu.weebly.com/uploads/1/3/4/4/134465429/nezixipokibewog-lasusazonedegof.pdfIn PDF document text
    • http://datifuxevewa.22web.org/nokagorulux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://ladakafojovawa.epizy.com/vipadowev.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/comprehension_worksheets_for_second_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/lg_sound_bar_model_number_sh2.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/85462233023.pdfIn PDF document text
    • http://zaleponi.epizy.com/9937257126.pdfIn PDF document text
    • http://fapiranug.epizy.com/tuladumojod.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79A 5360 bytes
SHA-256: 66ccbf40ae47c8b28afd3f472143cfff1fccdebce8943710c8bc33f3deb3eb2d
font_01_sfnt_off0000f9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BF 10144 bytes
SHA-256: babb8b53ea53923fdbf4fe871d2d4bf66ab27846b84b15b7e22a2a8b43462d99
font_02_sfnt_off00011c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f