Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5806730c5831262…

MALICIOUS

PDF

74.9 KB Created: 2021-03-04 10:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f49ebb3236618e502ee850ae5bab8a4a SHA-1: 612093348838efce5b87931d939acca024017823 SHA-256: d5806730c5831262a36cb162028787fccf8c5697fb03212a9dfb92016d5b51e5
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, includes a title related to conflict resolution, suggesting a lure to disguise the malicious nature of the links.

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=how+to+handle+conflict+resolution+in+a+relationship PDF link annotation
    • https://cdn.sqhk.co/ruzemesafe/wdheAmP/40602829871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425511/normal_600bd924ab7ae.pdfIn PDF document text
    • http://twitter-center.com/39075172017920ov.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/ibcphi2/7311714707.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453764/normal_600c47b00199a.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/98160912427l2v52.pdfIn PDF document text
    • http://alexsaf.ru/kiveligexeteduqbagt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416149/normal_600ff7f2a0898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411252/normal_601b6e9a794f6.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/cb7FhaF/coloring_pages_printable_unicorn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454982/normal_600c3ff84e979.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/Yijjeig/1721225713.pdfIn PDF document text
    • http://ouily.xyz/dungeoneering_guide_puzzleszcc4i.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/tesotegifu.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/10208415226040np.pdfIn PDF document text
    • http://tesocoin.online/what_is_flock_mean_in_spanish7gqdd.pdfIn PDF document text
    • http://pc-remont.website/stihl_concrete_saw_ts420_water_attachmentackmb.pdfIn PDF document text
    • https://cdn.sqhk.co/zesonixiv/jbq8dto/tobupujaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE882 5296 bytes
SHA-256: ca187ace662b095882fff7fde1e1885fea3fae78b368aef96cb5cb7c4747c6d9
font_01_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 10272 bytes
SHA-256: 37833b5d2905f60da392835c1b08b436666f9fe0d9637e678a865bffdb03c30f

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