Malicious PDF — malware analysis report

Static analysis result for SHA-256 9daea8529ac2f652…

MALICIOUS

PDF

80.7 KB Created: 2021-03-24 01:06:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b20f52ec45dce5184742a16c14f7fb91 SHA-1: d452fbf4dee5f72431ca3a576d611cdbec5c8ac8 SHA-256: 9daea8529ac2f652d34425faef65fafd8fda711164e550ad2a8d168b89720df9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which appear to be generated for SEO purposes, suggesting a link farm or spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are used to redirect users to potentially malicious PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/award?keyword=21st+century+astronomy+pdf+free+download
    • http://vehicleinsusa.com/vermont_castings_resolute_for_salelsel0.pdf
    • http://hotita.fun/sesoltsfup.pdf
    • https://cdn.sqhk.co/futevanu/igjj16H/97469700420.pdf
    • https://xoxujodega.weebly.com/uploads/1/3/4/3/134363828/ramusatadaxitev-fuzizexivasiwal-popenajanos-vusezax.pdf
    • https://vifewilepame.weebly.com/uploads/1/3/4/0/134012930/dugexenub.pdf
    • https://kunaxujo.weebly.com/uploads/1/3/1/4/131406864/0a01d1b57.pdf
    • http://fitnesspack.net/19625257197jyl2n.pdf
    • https://mazofowi.weebly.com/uploads/1/3/4/3/134312703/316716.pdf
    • https://muxixeronazuxup.weebly.com/uploads/1/3/4/5/134508557/tusiji.pdf
    • https://cdn.sqhk.co/deguxikezu/jbjcWd8/futubexotatetiledisobe.pdf
    • https://sumeropesoxiv.weebly.com/uploads/1/3/5/3/135316328/3802025.pdf
    • https://cdn.sqhk.co/ruzaxube/Pidhaie/al_ahly_vs_zamalek_highlights.pdf
    • http://antileqphh.site/48423971234j83nw.pdf
    • https://wiraxupafetob.weebly.com/uploads/1/3/2/6/132696263/xeduxajiv-kerawirenej-xanugegoli-sapevesenize.pdf
    • https://cdn.sqhk.co/fufigavaki/DqAgehj/survivalcraft_2_multiplayer_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7214d289-1403-4d82-adbb-2a5c934240a2/kujodamivulujozuvisilo.pdf
    • https://uploads.strikinglycdn.com/files/58b3939a-8827-4e98-a026-cb89e925d96e/casio_sgw100b-3v_review.pdf
    • https://uploads.strikinglycdn.com/files/c3eac6a1-21ae-4fc6-9bb1-daeb0f1e916a/11007865246.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd3f.bin
b734bf25437dca8dc47e97a8b742903a0c690df6fde9226ddb46b7d994834c5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 5584 bytes
font_01_sfnt_off00011049.bin
503b394d20e266c588db2fbca2cba943accead7348fd92c644a4577823846a9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 11060 bytes

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