Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fab4ced7ffd2d3d…

MALICIOUS

PDF

82.5 KB Created: 2021-05-08 12:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: faf0422fc1a36515b40f53dcbd8243b9 SHA-1: 72b6cd0d213185a704d3e212aa08b6adbdddf95f SHA-256: 2fab4ced7ffd2d3d359285ace1aaa08072da4cc679b9d95a77faea6e00462434
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-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://zajinet.ru/strik?utm_term=best+books+for+learning+stock+market+investing PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478383/normal_600277bf13a23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421207/normal_6019c825c82b1.pdfIn PDF document text
    • http://rikuximuvo.iblogger.org/report_water_outage_sydney.pdfIn PDF document text
    • https://vesasasafej.weebly.com/uploads/1/3/4/7/134758359/rudibaseterifar.pdfIn PDF document text
    • https://nuvefiwepopowu.weebly.com/uploads/1/3/4/5/134502743/8612756.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444123/normal_6012c43120021.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489609/normal_5fca7e63a65cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369182/normal_6010ef9416ed6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375093/normal_6011e16214003.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5fe99e2db8bf8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/082c9267-a59c-4128-8fab-eef4deac968b/mevoretozonizuxaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d664a096-d228-41e3-b301-c92458a0ea37/20935439792.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59262015-d93f-44d5-b9b7-d690ae7e01be/vepeg.pdfIn PDF document text
    • http://zifekop.rf.gd/translation_worksheet_biology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5864d809-a593-4fd3-9ab7-8c056c1ae7e8/vokexudanibome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1b93f8-8f6c-4684-b154-c3670ec1d020/todufi.pdfIn PDF document text
    • http://fowagamop.rf.gd/36832598228.pdfIn PDF document text
    • http://xupewopomiboti.epizy.com/aristophanes_frogs_and_other_plays.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc11790-2024-49fc-ba41-b3475e3fcda9/lixanolewakavoxebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9afffa55-f3a8-4197-8c84-25b8ab786a5e/wd_my_cloud_ex4100_raid_configuration.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_off000103ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 5512 bytes
SHA-256: a3d578a0fc79547f63a6d2e29c843866bec36b907e0a69ee39a2ffe53e4f6095
font_01_sfnt_off000116b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B0 11228 bytes
SHA-256: 4792f5d284d7acbdc47451d1bff122a255a7af51ecfa1de0c56917afbcff50de

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