Malicious PDF — malware analysis report

Static analysis result for SHA-256 753ba14157204275…

MALICIOUS

PDF

76.8 KB Created: 2021-02-24 20:03:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b7267b2ebbd2857680d5fa0420557365 SHA-1: 5d9086d9f02958bd4e858254169582b91e310e3d SHA-256: 753ba141572042752410b519bcd24b46b7774ad448f564e6b64ac10e3b3369da
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm on disposable hosting. The PDF contains numerous external URLs, many pointing to suspicious domains, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and extensive URL usage are indicative of attempts to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=canonet+ql17+battery+compartment PDF link annotation
    • http://dutuvowori.22web.org/amazing_facts_in_telugu.pdfIn PDF document text
    • http://meletemobu.iblogger.org/aplikasi_google_classroom_apk.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/how_to_clean_a_speed_queen_washing_machine.pdfIn PDF document text
    • http://trenketo.buzz/ludaxubojeba9k7zi.pdfIn PDF document text
    • http://vefejukexasiku.iblogger.org/ion_audio_air_lp_3-speed_belt-drive_bluetooth_turntable.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/bXgjhg3/mepovuruwevamejodebonimu.pdfIn PDF document text
    • http://vobarijijagurar.22web.org/sailing_christopher_cross_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/wevujawej/8mRJigs/welivopiwizoxufopeg.pdfIn PDF document text
    • http://suxulopiluv.22web.org/80026690430.pdfIn PDF document text
    • http://copyrighthelpbusiness.net/sojatavafogobirafoxevunulpbh7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pufupivati.epizy.com/58071493117.pdfIn PDF document text
    • http://wifepex.rf.gd/athena_goddess_of_war_ost.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 5164 bytes
SHA-256: 0b7a6211148ec4fee815ae9e80410d367b9a857d95a39d1669819e398cef6dec
font_01_sfnt_off0000f177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF177 11440 bytes
SHA-256: d822599d64c6196b0509ef7991a84012bc43708e1797dd95bc1d9fa2a87fb2fb
font_02_sfnt_off0001188d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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