Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9e73232d875c5f…

MALICIOUS

PDF

66.3 KB Created: 2021-02-09 03:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e060864ab03c25977c031d8c16f435e0 SHA-1: 5bdbbe8a8251dfcf13ebe81e60d8e273ba8fa0b0 SHA-256: ef9e73232d875c5f8c5994c984755b2d488e08d53dc6e23689c043b7d35e8f3a
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious 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://bologen.ru/wb?keyword=survey%20monkey%20questions%20template PDF link annotation
    • https://kozenuxifojani.weebly.com/uploads/1/3/4/6/134665776/fibat.pdfIn PDF document text
    • https://gerasulas.weebly.com/uploads/1/3/4/8/134861388/6946185.pdfIn PDF document text
    • https://nasaxedinevizuv.weebly.com/uploads/1/3/4/7/134759800/tipojuvuponidexonip.pdfIn PDF document text
    • https://sojuvamufivuleb.weebly.com/uploads/1/3/0/8/130874470/cf425d.pdfIn PDF document text
    • http://surogufepisim.iblogger.org/abstract_art_vector_free.pdfIn PDF document text
    • https://votarozoxanobo.weebly.com/uploads/1/3/4/3/134315144/fc62b9cbe.pdfIn PDF document text
    • https://debotokatetore.weebly.com/uploads/1/3/5/3/135345182/fupomupuz.pdfIn PDF document text
    • https://vuxilimibipemop.weebly.com/uploads/1/3/1/4/131453056/6068156.pdfIn PDF document text
    • http://bavunexebiri.iblogger.org/15076131491.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pumamolo.rf.gd/toxinofivadinemi.pdfIn PDF document text
    • http://wivifizurata.epizy.com/cbi_shankar_kannada_movie_video_songs.pdfIn PDF document text
    • http://buzawasilugije.epizy.com/bopilojiwos.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/auto_collision_repair_and_refinishing_textbook_answers.pdfIn PDF document text
    • http://tezufawifejede.epizy.com/sisifixopido.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_off0000c751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC751 5420 bytes
SHA-256: fb8cc37f4ccb5597bda0f7b89040a1146070db45757c96c5ba2cae72319ce59e
font_01_sfnt_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 10284 bytes
SHA-256: 0593bc8b85665ac72749115dfae98e6e04f433ea94f9b28ba15ef27f096789d7

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