Malicious PDF — malware analysis report

Static analysis result for SHA-256 7191eba04f9e48b3…

MALICIOUS

PDF

80.9 KB Created: 2021-03-03 18:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c5051881eb2bbd615960f91fdde165f SHA-1: 7c81ca00b20b4fc3b62a4323772d01c553e65389 SHA-256: 7191eba04f9e48b36b8b7ec02395cd28c1e3172057e38357e1cb2d56649a6e52
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or obfuscation, hence T1059.007 is included as a likely technique.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/123?utm_term=robert+anton+wilson+prometheus+rising+audiobook
    • https://feposogasutam.weebly.com/uploads/1/3/1/3/131384530/74fc2399e.pdf
    • https://cdn.sqhk.co/jebavimot/hhfifwq/97630292631.pdf
    • https://nujirami.weebly.com/uploads/1/3/1/3/131384028/8331368.pdf
    • https://cdn.sqhk.co/kerodamajop/MnoGjdb/gegeletumolamet.pdf
    • https://cdn.sqhk.co/gefimiwotux/Liajidz/78573373534.pdf
    • https://cdn.sqhk.co/dogutadova/ujbieat/ketorinifar.pdf
    • https://cdn.sqhk.co/werutojij/TggtjfJ/89181406298.pdf
    • https://cdn.sqhk.co/bugininaxi/gmLs8ja/colorful_cross_stitch_patterns.pdf
    • https://cdn.sqhk.co/gepeduvo/Ljgihig/71537872458.pdf
    • https://cdn.sqhk.co/tamoravuwera/ie4ieih/sky_force_world_war_3.pdf
    • https://lemefiware.weebly.com/uploads/1/3/4/0/134017231/7805349.pdf
    • https://cdn.sqhk.co/nepajenine/4E3vpid/6549076214.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/netinuwa/pdf_bm_spm.pdf
    • https://s3.amazonaws.com/lezopobigeza/97450508252.pdf
    • https://s3.amazonaws.com/bubeto/speaking_ielts.pdf
    • https://s3.amazonaws.com/vokeri/21612076401.pdf
    • https://s3.amazonaws.com/dazinibonofobi/best_apps_for_android_tv_box_ireland.pdf
    • https://s3.amazonaws.com/kizugokofo/which_statement_correctly_characterizes_bound_ribosomes.pdf
    • https://s3.amazonaws.com/dewutexorob/how_to_deal_with_conflict_social_work.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_off0000fca1.bin
5c754c8bfb4699a838538195580117d046ddf571dc9eaba01ba38eff42618639
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA1 5676 bytes
font_01_sfnt_off00010fdc.bin
4d1a0ea2202419e31019fcc2c621dae627b120b7f58229324002581d839ba383
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDC 11388 bytes