Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd3b32fd051ebf2…

MALICIOUS

PDF

73.8 KB Created: 2021-04-04 07:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 11332155cbcff520c3e4074d5ceb8710 SHA-1: 58f17ea4275553dbf8ebb81076babfef25f8268c SHA-256: bbd3b32fd051ebf2b37521c6ba372d590810500e4dc4195d7be2cae2a685c24d
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as a link farm designed to direct users to numerous external websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of many external links suggests the document's primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=huntington+harbor+kayak+free+plans PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450512/normal_604d7ab450b65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382614/normal_604124e49b3ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386366/normal_6016ff6b86c51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500001/normal_5ff557d4c634e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451035/normal_6054fbf52d20a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453100/normal_603fbed6571f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530070/normal_60431eab53006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391896/normal_5fd3083537954.pdfIn PDF document text
    • http://bitiwiz.medianewsonline.com/batezizimuvujuzelaxerewi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://woranuganavot.myartsonline.com/fun_home_a_family_tragicomic.pdfIn PDF document text
    • http://bilisedutave.myartsonline.com/popepiwemusefanafemaxa.pdfIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_064b3dcf908d46d88b93594ce9ed878f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/wimewidonamizenezixudupem.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/diary_of_a_wimpy_kid_2020_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/303320010.pdfIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_9acb15ceb0eb4a6a9d996b06e82af97b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropuba/55136883330.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_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 5428 bytes
SHA-256: 85b89232e09a4b3f982e9cd47194ef0d44c58331db63cfd03cc2a2441c83325e
font_01_sfnt_off0000f315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF315 10980 bytes
SHA-256: afb3e88784ea8d237ce1f87082b507fbcad4be56ea8e79b5d3d2445934467dd2

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