Malicious PDF — malware analysis report

Static analysis result for SHA-256 473b03788dd4d7e9…

MALICIOUS

PDF

79.0 KB Created: 2021-04-02 01:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7642565e222ea942933d153f0b615b6e SHA-1: 5e2d384762c74e1976fb837f7f020edfd8b0936d SHA-256: 473b03788dd4d7e91523115792f26870f8cb842e29abd678e8fe7c6415618afc
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also strongly suggest malicious intent. The document's content and structure are consistent with a phishing or content-luring attack, likely designed to redirect users to malicious sites or download further malware.

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://lozipotod.ru/123?utm_term=cirugia+bariatrica+bypass+gastrico+pdf
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/62a8d954b90af.pdf
    • https://cdn.sqhk.co/tavaxikanabu/1licUii/xopufovimopizeratonoli.pdf
    • https://cdn.sqhk.co/baxijaxazixi/hihhiZ0/cute_cartoon_wallpapers_hd.pdf
    • https://cdn.sqhk.co/nokulebepoba/fYVgfhi/new_horizons_credit_union_cincinnati_routing_number.pdf
    • https://mobinefoju.weebly.com/uploads/1/3/1/3/131398425/ririsoja.pdf
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/dozonekug.pdf
    • https://cdn.sqhk.co/wugotiparo/hfjisii/26210568069.pdf
    • https://cdn.sqhk.co/nosuterib/hbUibhi/rayan_hamrah_ios.pdf
    • https://cdn.sqhk.co/depifozopupe/dKOgheN/furniture_hubbard_oregon.pdf
    • https://kesizizuju.weebly.com/uploads/1/3/4/3/134384541/1893e6db9d.pdf
    • https://cdn.sqhk.co/mozozezowos/0je2QGS/word_of_the_day_dictionary_activity.pdf
    • https://xonatusapu.weebly.com/uploads/1/3/5/3/135391421/9293254.pdf
    • https://cdn.sqhk.co/kevovevude/hehhnii/vebimisoforotebinupuwizi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lanaladu/binonojixusagifefij.pdf
    • http://dagajevefud.epizy.com/26260620682.pdf
    • http://vurorawoguw.rf.gd/xewotupajodapuxad.pdf
    • http://ridupokibi.epizy.com/cb_radio_app_for_android_phone.pdf
    • https://s3.amazonaws.com/farefasejikap/31792164297.pdf
    • http://wosewusaboku.epizy.com/cauchemar_en_jaune.pdf
    • https://s3.amazonaws.com/desekusoxi/buzzer_app_android_iphone.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_off0000f3ce.bin
cbc8af6a3903700aa151a5e37066522b05fc4f8e674a915b790dba96568dd490		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CE 5436 bytes
font_01_sfnt_off0001065f.bin
44861d863033480e9e4c9e5de506f623263c3b2f98d5f4bb9f4101f2efeb256f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1065F 11888 bytes

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