Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa429e655e2c2a0…

MALICIOUS

PDF

41.4 KB Created: 2020-11-09 00:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 58f607c487f86735e516972ed1975648 SHA-1: 1d2ed8d0f16032219d3db58d4200833602cc4d2b SHA-256: 6aa429e655e2c2a0b35a1b1a58fd9f0af6285c448517dbfa59f8b8e507783812
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 1.0000

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.
  • 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://traffine.ru/123?keyword=blood+dripping+heart PDF link annotation
    • https://zemuxarasojutin.weebly.com/uploads/1/3/4/3/134374283/4977062.pdfIn PDF document text
    • https://farukipem.weebly.com/uploads/1/3/4/4/134473356/kisekasij.pdfIn PDF document text
    • https://sufexijim.weebly.com/uploads/1/3/4/6/134679247/3703915.pdfIn PDF document text
    • https://temoxemotedi.weebly.com/uploads/1/3/4/5/134599163/4699810.pdfIn PDF document text
    • https://lixotesit.weebly.com/uploads/1/3/4/6/134655402/punegutoxujeju_podusuwo_todunobotole.pdfIn PDF document text
    • https://wuzubetimu.weebly.com/uploads/1/3/4/2/134266391/605f2a9a.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/bejokazemur/employee_attendance_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/20280305941.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/muzzle_velocity_22_hornet.pdfIn PDF document text
    • https://gazimux.files.wordpress.com/2020/11/ukulele_chord_chart_with_finger_numbers.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_off00006483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6483 5092 bytes
SHA-256: 65c52ce34c4679d21da443eda92e90c3ec9ad3c88dbf57aa60a440608a86b0e9
font_01_sfnt_off000075ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75CE 10356 bytes
SHA-256: 268d8869521abd9b02a18cf6443d56077164b368d055cb6b3567f0e59c724895

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