Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ec43ffb51c860d…

MALICIOUS

PDF

65.0 KB Created: 2020-11-19 03:59:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 97d27181883560ba7a87cc0a4e69926f SHA-1: de8437fac8df322ad4c41d05cea9aa20f3d02233 SHA-256: b4ec43ffb51c860dc468f7fed8813bea64ff061909324dbc0beca34c8a11c29e
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-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.
  • 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/aws?utm_term=220uf+25v+capacitor+datasheet PDF link annotation
    • https://denepuwukofakar.weebly.com/uploads/1/3/4/3/134316944/6362038.pdfIn PDF document text
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/1e0f661.pdfIn PDF document text
    • https://rovemijiv.weebly.com/uploads/1/3/4/3/134343091/fipuzakefafonom-xegifibi-sakapeno-favatiwajexub.pdfIn PDF document text
    • https://vidojibirulon.weebly.com/uploads/1/3/1/0/131070792/3757905.pdfIn PDF document text
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/bc71e621f30cf1.pdfIn PDF document text
    • https://lubebubekawi.weebly.com/uploads/1/3/4/7/134714091/9940506.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/47f36f92-6e8c-4930-b471-a135f1aaa9d1/76312154132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2e8371-a461-4bb1-a1a2-c05cc50f5458/rocksmith_2014_xbox_one_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f69390-763c-48f6-bd90-99d0470f8bdb/lupemimuneretutidexos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/080f027d-e714-466e-848b-17ae1ea4034f/gawefakapiwapojifaxekare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aed3169-de96-4ee0-8617-9e64c7c4f870/37305544121.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/21664964937.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/233d65fa-1e07-4927-aeb3-12a8845d1c91/zewukaxibukoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67c5ee32-db55-4505-8b4b-20953af452b5/wezefopanasobuzididepud.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_off0000bcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDB 5572 bytes
SHA-256: f72c995327417164aae1ac304135e4eec760c9688bf5c78bc2b9ec4879940d75
font_01_sfnt_off0000cfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD5 11704 bytes
SHA-256: 85fcbcb5b21a5d162dc9d6b8e1db31a30bac9676c328c272d25bcb4fa77c4b86

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