Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5f5f4dca968e965…

MALICIOUS

PDF

69.0 KB Created: 2020-11-10 06:50:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6100ecd83cc4c4ff2a7d4f5f4deecca3 SHA-1: 937739bf74cc536b161282df88a7af309764515f SHA-256: b5f5f4dca968e9655e76716bd02bf59875865b5b97aab652ee4097f67fd7f4a4
194 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 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 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafficel.ru/strik?keyword=dinosaurs+after+dark+pdf PDF link annotation
    • https://wozedekasejop.weebly.com/uploads/1/3/4/7/134703393/pazoruwujube_vugem_fojam.pdfIn PDF document text
    • https://tifedufuzitiji.weebly.com/uploads/1/3/4/3/134353288/d8a23ff49.pdfIn PDF document text
    • https://titawijuneve.weebly.com/uploads/1/3/4/0/134012454/ac2145b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463275/normal_5fa23c1f383a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408601/normal_5f9be42cdc6e4.pdfIn PDF document text
    • https://rodekimixew.weebly.com/uploads/1/3/4/3/134314341/luwubakujetenapavez.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/194593.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/janodojivi/78016935701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1261e742-30f5-4f32-97b7-4ec060de9637/rufus_king_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/19326082035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc6d66b3-2ca2-4dc5-8267-06a39640c212/pixixiterevegejawubu.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_off0000d177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD177 5064 bytes
SHA-256: 0bc6cc1a0f7a8cf00c5e2be1463ffe6986e73c22dc0acae3912b4b2d0e8e0d53
font_01_sfnt_off0000e2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CE 10904 bytes
SHA-256: 58b15dc2cee7023b85aa65ecf56c399897aa06017b77e62c3c7d9f9474ca49be