Malicious PDF — malware analysis report

Static analysis result for SHA-256 09810e3251ecf1ad…

MALICIOUS

PDF

87.5 KB Created: 2021-04-14 01:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c83ee3d0aa260fe4f66508b6fcb72667 SHA-1: 85fa336324ea939dcaabc12a2eef4d4a243cd8a6 SHA-256: 09810e3251ecf1adaf93f7e4d69e38c04bf02a7f4576005d6077f8cd950e81db
186 Risk Score

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-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.
  • 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://maypoin.ru/strik?utm_term=what+is+the+meaning+of+cybernetics PDF link annotation
    • https://mokabeninenaji.weebly.com/uploads/1/3/4/0/134013120/dc255ff4.pdfIn PDF document text
    • https://dezitatukuti.weebly.com/uploads/1/3/5/3/135389988/jefep-sesuxu.pdfIn PDF document text
    • http://vuvopogawuxaxax.22web.org/dakadexa.pdfIn PDF document text
    • https://xaredoluvowa.weebly.com/uploads/1/3/1/8/131871785/fofolimid.pdfIn PDF document text
    • https://dimenitajobe.weebly.com/uploads/1/3/4/4/134444553/puvepinade_gazodejelekepo_sokigofuwiwe.pdfIn PDF document text
    • https://zokevuwokonumez.weebly.com/uploads/1/3/4/6/134682223/8807267.pdfIn PDF document text
    • https://dedopaka.weebly.com/uploads/1/3/4/4/134498192/jizisiberizerot.pdfIn PDF document text
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/08a22.pdfIn PDF document text
    • http://vuvodagedene.scienceontheweb.net/sonny_s_bbq_menu.pdfIn PDF document text
    • https://gegotebure.weebly.com/uploads/1/3/1/6/131606057/2457388.pdfIn PDF document text
    • https://nerilumasufut.weebly.com/uploads/1/3/1/4/131437044/d57a0281df5.pdfIn PDF document text
    • https://jonipafatanepa.weebly.com/uploads/1/3/2/7/132741476/dibekob.pdfIn PDF document text
    • https://kakadolaronenun.weebly.com/uploads/1/3/3/9/133997154/91589772ed315cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f95bebf3-6e70-44a0-a435-e8b8729243a1.filesusr.com/ugd/f34823_4c9bce8b0b6e4dabb552e6eb96be63b6.pdf?index=trueIn PDF document text
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_a5ef7f1d21f944e38fe03584074747e6.pdf?index=trueIn PDF document text
    • http://rojanesifilagu.myartsonline.com/bestiary_pathfinder_download.pdfIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_745717bd79f54a25ba03ff421662ba85.pdf?index=trueIn PDF document text
    • http://pakekaririwofas.rf.gd/tukodake.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_off000118e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 5520 bytes
SHA-256: 391a6184e871ea74dd2551812d0bf4995682254da4039457b8f7bfffec63b80b
font_01_sfnt_off00012b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B94 11284 bytes
SHA-256: c6f154224ce01f9510095a1aba923c22dda5c076e6e73bbbf22b0ae9ac393ac6

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