Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac21ea4752c0847a…

MALICIOUS

PDF

73.3 KB Created: 2021-02-17 21:45:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f2cb9d00f93f14408852ba4fab61a978 SHA-1: 9c677ad0fb8c86993dda5677b079e59fb21b1214 SHA-256: ac21ea4752c0847ae17074c89adc6f1df9b9bbf4d9cfaa1ef3f06602f1bf0d0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/strik?utm_term=denon+avr-s510bt+owners+manual PDF link annotation
    • http://50offshop.pro/risewefonepufisalexs.pdfIn PDF document text
    • http://i-men.ru/spotify_premium_app_freekybvv.pdfIn PDF document text
    • https://zuvofuguwapu.weebly.com/uploads/1/3/4/0/134042474/goxetu.pdfIn PDF document text
    • http://ebay-coupon.ru/chemistry_regents_review_sheeti1tcv.pdfIn PDF document text
    • https://nazalufu.weebly.com/uploads/1/3/1/4/131409274/dozozej_vubovil.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/MCaUJgh/red_ball_4_unblocked_volume_3.pdfIn PDF document text
    • http://wellwork.site/crew_application_hourly_onlywd5c1.pdfIn PDF document text
    • http://helpcontactform.com/5496153224ew7r6.pdfIn PDF document text
    • http://vk-settings-change.online/amores_perros_control_machete_song_320kbps6mwt9.pdfIn PDF document text
    • http://magnetfix.store/938051435241jetj.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/nawosineromigi/tan_platform_high_heels_uk.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_off0000e1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D5 5472 bytes
SHA-256: a05191e58a98925a06e115ca571d4d4a9cd53c07a7f91fe63a82ff350fdbfd37
font_01_sfnt_off0000f480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 10708 bytes
SHA-256: af0e48debab77cb331f93cf422ad463b5ab0428a7b644f05d3e7cd3d0891e65e

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