Malicious PDF — malware analysis report

Static analysis result for SHA-256 d81f67bff9bab858…

MALICIOUS

PDF

66.0 KB Created: 2021-03-04 09:16:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 956fc6cb3509a1c1b3f5039e7b540e29 SHA-1: ffdf22d739972a1b2026ee4519ac3ff2d1019ada SHA-256: d81f67bff9bab85852d40043aa782a72a8e5ea3565328b2e53dc8747a36b526d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a likely phishing or malware distribution attempt. The presence of external URIs and the 'link farm' heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

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://druttle.ru/award?keyword=klipsch+r-10b+no+sound PDF link annotation
    • http://brumbum2.xyz/dlink_dir-601_firmware_downloadi1q1d.pdfIn PDF document text
    • https://zemonawajut.weebly.com/uploads/1/3/4/6/134688337/4ba5d.pdfIn PDF document text
    • http://ipoteka.net/brain_training_puzzlesgx6u3.pdfIn PDF document text
    • http://form-copyrightservices.com/green_day_audio_songsl5llz.pdfIn PDF document text
    • http://reduslim-italy.site/febakokimit22l9w.pdfIn PDF document text
    • http://esclub.pro/onn_fixed_tv_wall_mount_instructions2qpy4.pdfIn PDF document text
    • http://radanews.site/fundamentals_of_physics_hallidayhvn5x.pdfIn PDF document text
    • http://biotringel.shop/momasemelesowajefunigilajhk8s.pdfIn PDF document text
    • https://demuxovepeb.weebly.com/uploads/1/3/4/3/134311881/boxopugobegilat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490266/normal_5fd1b78930c92.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/Ajh16ja/junosisowoneg.pdfIn PDF document text
    • http://gratoraama.website/cengage_mindtap_psychology_answers_chapter_2r7dtp.pdfIn PDF document text
    • https://cdn.sqhk.co/revujinarewu/ihdhc9l/atarax_side_effects_in_elderly.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mepefixo.epizy.com/tikiwoxesanu.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_off0000c750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC750 5284 bytes
SHA-256: 5e4c748769294b66723e79a182370d674b3a7952b02c3bcf6087c509fa23d0e1
font_01_sfnt_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 9988 bytes
SHA-256: 5a9500c2a47d616b3fffe67bf4c7daaa123131f463213887bfd77e179e74db92

Open this report in the interactive analyzer, or submit your own file for analysis.