Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f8d0565a14c756…

MALICIOUS

PDF

66.9 KB Created: 2020-11-23 16:52:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9131677e1cc12182c2ef9fd4a49cd6ae SHA-1: d5da87e9bd2b68d7d0578990d1dd6a2e7ac26686 SHA-256: b0f8d0565a14c756001404478f7c2ccd24b6ea12d8a2f6f5084fb87f0c3e38b8
156 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 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/123?utm_term=insect+body+parts+diagram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5fa5b63c5feff.pdfIn PDF document text
    • https://diriremipujuna.weebly.com/uploads/1/3/4/2/134265666/lekox.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/8c3f11ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f9163f1f14a8.pdfIn PDF document text
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/dudejelutoxoweterif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389821/normal_5f9e1938a2a8e.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/gidibesuxi/colorado_rockies_game_live_stream_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/gikifizaki.pdfIn PDF document text
    • https://s3.amazonaws.com/wejalixex/sogavegiluf.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/lijoremanavalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c6a4d5-2102-4962-80a5-4fba15041a5d/kixatotaxukuxas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/192b27c0-8677-4da1-a847-09104ecf9c55/rowijonelokolibeme.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_off0000c9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 5540 bytes
SHA-256: a02588c94e31164989484f3d732cb74179fd25767a21a2659d6a8c011958d063
font_01_sfnt_off0000dc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7F 10180 bytes
SHA-256: 218400e749976afb18f0cae6c9862d79df82d80f408b05fb206334d2e1805571