Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15a54ce53362cd0…

MALICIOUS

PDF

71.6 KB Created: 2021-02-24 02:14:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ddcc5172a2a03df5747424ef2b9ae1c5 SHA-1: fbef097558123b1d80df5723a873102f5c46477f SHA-256: f15a54ce53362cd0457ea95fb5d16b0ce58e264d52f608b2d300434da5f5686e
186 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. 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://leonvi.ru/aws?utm_term=champion+generator+home+depot PDF link annotation
    • https://tefegori.weebly.com/uploads/1/3/1/6/131637168/jivitixofopaxiket.pdfIn PDF document text
    • https://cdn.sqhk.co/xezufulozuwo/ibuMIhj/30100697754.pdfIn PDF document text
    • https://cdn.sqhk.co/bopelara/Wifx9hc/live_streaming_apps_for_firestick.pdfIn PDF document text
    • https://wajirabipuxu.weebly.com/uploads/1/3/0/8/130874591/zidizo-wekol.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/786a3123114.pdfIn PDF document text
    • https://nujujuzizupefe.weebly.com/uploads/1/3/1/6/131606206/jinebawim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407302/normal_60025229760c9.pdfIn PDF document text
    • https://cdn.sqhk.co/febenanedibu/fgchcha/21103898568.pdfIn PDF document text
    • https://dagakaxogofawi.weebly.com/uploads/1/3/4/6/134699425/tijeninupubix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451225/normal_6021782a44b09.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/putelekireza/zusepepirufosoxorowoleni.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/blender_2._79_64_bit_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/json_to_html_formatter_c.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_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 5068 bytes
SHA-256: ce86d067308998041adff714ac0766b17adfee100ba6ca53443b6bf854b035ee
font_01_sfnt_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 11192 bytes
SHA-256: 80dfd3914d4b3a36b7eb4df64dfce1b21a1504ce0c1f9b85531bc5c7a74f0738