Malicious PDF — malware analysis report

Static analysis result for SHA-256 522362d1831d9082…

MALICIOUS

PDF

69.1 KB Created: 2021-03-03 00:25:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d9958d2d4810b04cea49affe6be191d7 SHA-1: 736e5c4f43ace78ca4848aa8aa4c77696ea409b3 SHA-256: 522362d1831d9082fd591e52acbab891c5353992748da00cbba4af4ac285df34
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable hosting and potentially malicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely leveraging T1059.007 if any JavaScript was present but not carved.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/wix?keyword=fond+du+lac+rec+dept+baseball PDF link annotation
    • https://sisumojixidew.weebly.com/uploads/1/3/4/3/134355683/saronagiwudanub-lubiboxe.pdfIn PDF document text
    • https://sudejewakigalo.weebly.com/uploads/1/3/4/0/134040490/mazalefojol_xogud.pdfIn PDF document text
    • http://jokojujut.medianewsonline.com/fobamisuwejevufepuz.pdfIn PDF document text
    • http://katipef.medianewsonline.com/what_is_introduction_to_philosophy.pdfIn PDF document text
    • https://zotekuruwufuk.weebly.com/uploads/1/3/4/1/134108654/lamelifuxetuv-vomutizu-ruvadopusonir-luwodofadawis.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/how_to_program_chamberlain_garage_door_opener_keypad.pdfIn PDF document text
    • http://bred-enligne.com/tupac_greatest_hits_album_coverl695l.pdfIn PDF document text
    • https://wovugozota.weebly.com/uploads/1/3/2/6/132695813/zugod.pdfIn PDF document text
    • http://onlinesos.tech/washing_guide_symbols_ukc2e4i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://namepafubi.atwebpages.com/ncees_fe_results.pdfIn PDF document text
    • http://wufikemofumop.atwebpages.com/maytag_bravos_xl_washer_service.pdfIn PDF document text
    • http://kepozofa.epizy.com/what_is_the_woah_song_from_tiktok.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/loxifegemi.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_off0000d398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD398 5164 bytes
SHA-256: 1961711c357fe0ed97d34b53146449cddbd60f16037c4aa3eb9692b81f1a5099
font_01_sfnt_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 10224 bytes
SHA-256: 4d33c583fa13a01a08bee451b46c8da00eb9a13d8a7695048a7a4343ba2c081d

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