Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0cdd846e2f2517b…

MALICIOUS

PDF

80.0 KB Created: 2021-04-12 16:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e97c23cd96c3f3e3ca558f89a1db87b5 SHA-1: 876d6034fb842f028dc7699c602d6beac67c8528 SHA-256: d0cdd846e2f2517b2a3d019290bc1e23b1228465b86a28d397d7aae7878873f0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/strik?utm_term=completing+the+square+word+problems PDF link annotation
    • https://cdn.sqhk.co/genazeres/9uPhcy8/fantasy_premier_league_gameweek_12_deadline.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482230/normal_5fff6667119a7.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/X1jhjv8/57541262259.pdfIn PDF document text
    • https://cdn.sqhk.co/feduminaro/gJJKhdm/enerpac_tool_group_menomonee_falls_wi.pdfIn PDF document text
    • https://zinegekoxemajaj.weebly.com/uploads/1/3/4/7/134767253/vobaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_5fe838ee19e17.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5feee44838979.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/83467757703.pdfIn PDF document text
    • https://nekazadezi.weebly.com/uploads/1/3/4/6/134662300/taparagone.pdfIn PDF document text
    • https://razivizufizide.weebly.com/uploads/1/3/4/5/134525322/vigilinadotavewava.pdfIn PDF document text
    • https://cdn.sqhk.co/govazilose/Ajghjro/35769713316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487658/normal_603b287ac9391.pdfIn PDF document text
    • http://tuwukadinem.mygamesonline.org/website_accessibility_checklist.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414489/normal_5fddc51749431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490127/normal_600a73306cef3.pdfIn PDF document text
    • https://cdn.sqhk.co/pugalaleluti/hejhFjj/nozenipekabiwubude.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://f4a80ce2-0a24-44e2-aff7-13c87a434ee9.filesusr.com/ugd/ace063_86cf11a397224d8fa3e5af81799d8bb0.pdf?index=trueIn PDF document text
    • https://d7d9470a-9784-4c28-ac68-b1ab0f70ddf3.filesusr.com/ugd/148484_65436bb9f863459f82b605ceb6911625.pdf?index=trueIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_d2b648cb7ba04759acc8dbeb3cef9ea1.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 5636 bytes
SHA-256: ed69ca9b8a0b1de55dab72449a97091ec9d8e530e6a51c8c0dbe77e5eefee349
font_01_sfnt_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 11492 bytes
SHA-256: 499a971771ac98c2c94c74d727d8c718abd9c8975980921df1fb545e6d6cc858
font_02_sfnt_off000124d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D3 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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