Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4e24c93ddabea4…

MALICIOUS

PDF

72.9 KB Created: 2021-02-28 13:46:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a39d87e013c52fedcd5c57cae1ddcf33 SHA-1: 6386336faea1b3151cbdc3111edb249ad0e4fb05 SHA-256: db4e24c93ddabea4df0acd83df7a64b186c81a88a8a3f38dd189ba66ced5e5f1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm designed to distribute other PDFs. The primary malicious URL, https://mezovuduw.ru/123, is presented under the guise of a guide for programming a garage door opener remote. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/123?utm_term=how+to+program+a+genie+garage+door+opener+remote PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368984/normal_6035c2e9f1f9b.pdfIn PDF document text
    • http://zenarajare.22web.org/91680413549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451752/normal_5fd2a7c703884.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/iahcjbG/89216618125.pdfIn PDF document text
    • https://zamidagotef.weebly.com/uploads/1/3/1/4/131453459/806723.pdfIn PDF document text
    • https://cdn.sqhk.co/wememiguw/Senhbgg/simple_vanilla_cake_recipe_without_baking_powder.pdfIn PDF document text
    • https://mewifukemi.weebly.com/uploads/1/3/4/7/134764424/wozenazezelefox.pdfIn PDF document text
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/vamizexenixiporefepa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378153/normal_60100438de903.pdfIn PDF document text
    • https://cdn.sqhk.co/vavuvalegel/37hiqHL/81208937004.pdfIn PDF document text
    • https://cdn.sqhk.co/vopiruwikil/6higFTw/earth_protect_squad_third_person_shooting_game_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393790/normal_6004f766b0e5c.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/zetituri/apocalypse_rising_hacks.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/989601056.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/expense_report_template_excel_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/divelikubapiwaj/driver_hp_m402dne.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_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 5120 bytes
SHA-256: bbcc03188a0b9303d9cea7cc6d52d66e74709f40e4cc786dabde75ad46ebd619
font_01_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 10604 bytes
SHA-256: 2ad9ab21e8fc02109d6bf26c07e5900187ea7f0c32288d715c617ae3f4718d9c

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