Malicious PDF — malware analysis report

Static analysis result for SHA-256 329374aacea80b25…

MALICIOUS

PDF

157.2 KB Created: 2021-06-13 10:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c84ab6bc54c3e5f53a47db4199f425cc SHA-1: de3632f1a93e03a8965143b7b5af7729811dd229 SHA-256: 329374aacea80b251e4d3ff3a2e93f8509796bfb6342e14104041cbb8e45e87b
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a high concentration on disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pelibifir.ru/123?utm_term=babhana+mange+chumma PDF link annotation
    • https://xafukulirodut.weebly.com/uploads/1/3/1/3/131379356/3b287d32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_6015365103392.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464083/normal_601b3e14c02dc.pdfIn PDF document text
    • https://napuvenorabinu.weebly.com/uploads/1/3/4/4/134490891/vakiremunolemi.pdfIn PDF document text
    • https://fimupekegu.weebly.com/uploads/1/3/4/5/134502303/gujazo-pumokariwobir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446761/normal_5fee09349c1cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424009/normal_604929b21ac7d.pdfIn PDF document text
    • https://nulevilisibonu.weebly.com/uploads/1/3/4/5/134585613/65c308aa.pdfIn PDF document text
    • https://ruvatekokero.weebly.com/uploads/1/3/1/4/131437102/91e9bd800.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://poxanoralanu.pbworks.com/f/dressing_up_adverbs_worksheet_1.5_b_answer_key.pdfIn PDF document text
    • http://zexowisam.pbworks.com/w/file/fetch/144426231/autodesk_autocad_2018_tutorial.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/w/file/fetch/144682752/go_karts_racing_for_toddlers.pdfIn PDF document text
    • http://xofitesu.pbworks.com/f/titareluburogi.pdfIn PDF document text
    • http://palejemevat.pbworks.com/f/speak_well_english_book_in_hindi.pdfIn PDF document text
    • http://gapufipi.pbworks.com/f/download_nitro_10_full_crack.pdfIn PDF document text
    • http://gezibilivun.pbworks.com/f/12750079730.pdfIn PDF document text
    • http://gutupum.pbworks.com/w/file/fetch/145110078/62834414040.pdfIn PDF document text
    • http://gezebal.pbworks.com/w/file/fetch/144936603/race_to_ratify_icivics_worksheet_answers.pdfIn PDF document text
    • http://movovepavuzi.pbworks.com/f/how_to_get_aramco_vendor_id.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_off00022da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22DA6 5096 bytes
SHA-256: 8d8fb93f107c93be29d491cd63de0717c6afed0d697269725804e957b0e1f29f
font_01_sfnt_off00023ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23EDE 11604 bytes
SHA-256: c19b9ce37fa4784c0b58fed8260e625862d4fe2779f91b3ffb0b63fd8897b71b

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