Malicious PDF — malware analysis report

Static analysis result for SHA-256 3645fad1aca5a238…

MALICIOUS

PDF

82.8 KB Created: 2020-11-17 14:41:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 259d86f5b0f2cb11aa371442e21f7a56 SHA-1: d38f3178671c6a520bcb355abcf69aa4df76bba5 SHA-256: 3645fad1aca5a238c96a0abc383e4841104ea78c1d73c586a7f3105c463fc56a
164 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 and presents a deceptive download button. 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffe.ru/123?utm_term=venus+factor+app PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389805/normal_5fa0bc7e03f11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_5f95bc5dccd17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f92765ea0556.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377642/normal_5fb268d2776e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452372/normal_5fa8ed5229e02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474231/normal_5fa994164c14e.pdfIn PDF document text
    • https://vabofofed.weebly.com/uploads/1/3/4/3/134337048/ferurug_xazabigul_wakijalov.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/12556.pdfIn PDF document text
    • https://jaketomerinojox.weebly.com/uploads/1/3/4/1/134109184/vupafal-renulivi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/subud/sonubeguromigarilifekuja.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/case_sr220_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb5c955-ddca-4cd7-8ad7-045d4bdd2ce2/wowimojoxelobitatinem.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_off000108d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D3 4944 bytes
SHA-256: 633dae3454dd159c3a82cf65d4d5962342749a8853ba8ff5793513637a05f828
font_01_sfnt_off000119bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 10908 bytes
SHA-256: 53525ae4a0e9889fdf896d83d0ab3d7b2245eff02b38b76be736cbe3380f6487

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