Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58ee2af2805ec20…

MALICIOUS

PDF

61.6 KB Created: 2020-12-18 11:59:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3d0169d862da39591273f2bdbf70055b SHA-1: d15cb4b92b5e49b6a5273af08061745c4e91c857 SHA-256: c58ee2af2805ec20ac3d6a085ddd220738a30b60bdc55b534a48b8608a9fe8ee
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The document body, though heavily corrupted, appears to reference 'Festool parallel side fence and guide extension', likely a lure to disguise the malicious intent. No scripts were extracted, but the presence of numerous external URLs suggests the primary function is to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=festool+parallel+side+fence+and+guide+extension
    • https://cdn-cms.f-static.net/uploads/4406782/normal_5f9848dcc6f73.pdf
    • https://faxuledobiwud.weebly.com/uploads/1/3/4/3/134311760/8685001.pdf
    • https://cdn-cms.f-static.net/uploads/4406223/normal_5fd17ed8a991b.pdf
    • https://cdn-cms.f-static.net/uploads/4378831/normal_5f8b1ee6531ae.pdf
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/7619006.pdf
    • https://cdn-cms.f-static.net/uploads/4381297/normal_5fbab2e768325.pdf
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/178fa0a341.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3f6e5945-69af-4b32-b224-c097df9daa59/jojo_king_crimson_theme.pdf
    • https://static1.squarespace.com/static/5fc15df1e9fc3622d5255c20/t/5fc635453c6ccf69f3328cf0/1606825285797/little_pets_animal_guardians_mod_apk.pdf
    • https://s3.amazonaws.com/benubapopikaj/baldi_s_basics_mod_menu_apk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af78.bin
a5e13b82554d36fec1090099f06362deb35d24c186dc65aaf29ceada32960289
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF78 5348 bytes
font_01_sfnt_off0000c1c1.bin
7aa01ce078b67c401a599206ffa4dce86ef2fd491113fbf058104f979f2ae6c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C1 11268 bytes