Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ffec91cc13b1edb…

MALICIOUS

PDF

71.5 KB Created: 2020-12-25 11:53:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fbf6984be47c1c12cf4b2708de44a195 SHA-1: 14a7ced1c10ea02b37d1693a6cd5f18e81750b38 SHA-256: 2ffec91cc13b1edb76921cad1f1e8ff6412e7cf4fd002345b33995e04d827015
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 0.9997

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://traffset.ru/strik?utm_term=spin+clothes+for+sale PDF link annotation
    • https://xejulanuvupif.weebly.com/uploads/1/3/2/7/132740270/fagigojinemu.pdfIn PDF document text
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/bevotarajeduvo_didosiw_nuragi_lubabavo.pdfIn PDF document text
    • https://lepebixetuvenal.weebly.com/uploads/1/3/4/6/134634058/rebogexegomap.pdfIn PDF document text
    • https://zotadapavera.weebly.com/uploads/1/3/4/4/134483721/lusidekovulugopirisa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471099/normal_5fcc0c9ddda8b.pdfIn PDF document text
    • https://zibaxewax.weebly.com/uploads/1/3/4/6/134699960/c2d43.pdfIn PDF document text
    • https://\/maddoggIn 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/7fb4838b-6e36-4a91-85d3-37694753cd93/tv_channels_streaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/251944f4-dd6e-4f8d-a2ae-1f664676621f/jegawujo.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/99875509331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0685d4fb-3a5f-4aca-8551-46d9771734f4/pifesagadurago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66cab393-0287-4f75-a372-ed418c2ec016/multimedia_video_controller_driver_windows_7_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5788faef-acb3-4626-bf59-fd9441813b24/hulu.com_welcome_on_your_computer.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_off0000cd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD47 5208 bytes
SHA-256: 1192e98061615d0e67d469805c334db41278e0ff37acfb0e36ced31dd49d768c
font_01_sfnt_off0000def7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF7 16232 bytes
SHA-256: 01fd5c0488f9c371fdebeaacdd322211aecbfbc876d3a5326dcfe3d64c7c1270

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