Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79a4513ea64bd63…

MALICIOUS

PDF

101.5 KB Created: 2021-03-17 06:30:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f7425a939720ffeba83bf9d2f1e640b SHA-1: dc264a9257daa95aa618216c9438be4f00844980 SHA-256: f79a4513ea64bd6389cf5d48bdf833b02be07871876cbb0e924b564acae3de0f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to PDF files, suggesting a link farm or redirection mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/wix?keyword=vocabulary+study+guide+template
    • http://fibaxoxadomi.sportsontheweb.net/kimasupipexarimeve.pdf
    • https://lomixefewagad.weebly.com/uploads/1/3/4/5/134592496/f1befbbb7abd.pdf
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/maxuxuwovugup.pdf
    • https://wupupuredizuso.weebly.com/uploads/1/3/4/8/134894828/rerufetig.pdf
    • https://somolepudurupe.weebly.com/uploads/1/3/4/3/134332146/wufib-mujagevofesiku-zusexakuzem.pdf
    • https://balixilime.weebly.com/uploads/1/3/1/3/131398392/zilakibu.pdf
    • https://fedoxamanisoru.weebly.com/uploads/1/3/4/6/134668372/jadisepawute_xuwuwimuret_fogatowikep_wowijidabiro.pdf
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/wapebevabugaf.pdf
    • https://xagigerabep.weebly.com/uploads/1/3/1/4/131483632/2d7fbf3f4a4.pdf
    • http://cookwellbakewell.com/teach_yourself_visually_office_20165y2a3.pdf
    • https://botomaluxezevip.weebly.com/uploads/1/3/4/3/134340767/6645861.pdf
    • http://muvepifare.mygamesonline.org/as_time_goes_by_sheet_music_free.pdf
    • http://stavki-na-sport.site/who_manufactures_snap_on_torque_wrenches97ft8.pdf
    • http://revilokepudidu.mygamesonline.org/24672925337.pdf
    • http://denizan.com/new_delhi_road_map_downloadegrtb.pdf
    • https://tezadogiva.weebly.com/uploads/1/3/4/5/134522012/lejuwogi.pdf
    • http://indir-kazan.com/183172144518w3r0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nagudo/zasudogusaduk.pdf
    • http://raxegujanamefas.atwebpages.com/14612392750.pdf
    • http://vavadot.onlinewebshop.net/61815190586.pdf
    • https://s3.amazonaws.com/kefefetafij/bunomafibazonenadotef.pdf
    • https://s3.amazonaws.com/vovopafubipu/android_auto.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_off00014c2d.bin
44dce7bd13764a488324c9c23fbe3963a1a8a90855e159b1a58b7e218a806f16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2D 5600 bytes
font_01_sfnt_off00015f2a.bin
017c48337f64070836957ed0c67398267f7debb865aa8a8973928d88b45f7939		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F2A 12852 bytes

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