Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d9766bb622f081…

MALICIOUS

PDF

77.0 KB Created: 2021-03-29 21:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f5a83f36c9b77bcfe71d2b5d8ec3fea5 SHA-1: c1f4b25d80c9bc195ff1d51f6422a74088eca95e SHA-256: 49d9766bb622f08163d3ec59430f370c2da7295913f7c1033959af02185d5f41
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a "PDF_SEO_LINK_FARM" heuristic, suggesting a malicious intent to manipulate search results or redirect users. The ClamAV detection and ML classifier further indicate maliciousness, specifically flagging it as a phishing or trojan. While no scripts were explicitly extracted, the presence of numerous external URLs and the "SE_INVOICE_LURE" heuristic point towards a phishing or malicious redirection attack.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pelibifir.ru/123?utm_term=catwoman+imdb+parents+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369514/normal_5fef590946a0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409796/normal_605d9a11bcae3.pdfIn PDF document text
    • http://zijogodakenanaf.22web.org/xomoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393359/normal_601424541ebdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372384/normal_5ff5cf33279d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480423/normal_605a584b4be0c.pdfIn PDF document text
    • https://tatuwimo.weebly.com/uploads/1/3/4/8/134882860/dejilerajefigenum.pdfIn PDF document text
    • https://dagigofeno.weebly.com/uploads/1/3/4/8/134887245/67750.pdfIn PDF document text
    • https://sugabora.weebly.com/uploads/1/3/4/3/134369176/pewujavepariwij-badabegufezu-divuvoxol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413585/normal_603ea409e570d.pdfIn PDF document text
    • https://jopokiwajisi.weebly.com/uploads/1/3/4/1/134108554/dajike.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464700/normal_602aabe220bc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lugaxelike.rf.gd/34789259696.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/the_cause_of_moon_phases_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/63235589747.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/tutaxowavakad.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/10555800396.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/favourite_things_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/dogemexa.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/51011157706.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/felalokar.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_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 5384 bytes
SHA-256: 365ffa4d4f4e996d70b253abc3528a926f8233b337595348c6354a9b6f909d1c
font_01_sfnt_off000102dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 10368 bytes
SHA-256: 8d9bf860601227dbc9c95f11bb50e7d84027036e82fc09f4fbc14504c7f7c71b

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