Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc1bb3f6cf6c85c…

MALICIOUS

PDF

82.0 KB Created: 2021-01-25 12:57:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 50e1234a05922fc2f6075e108f3aee3f SHA-1: ac79fe19db4619b94c687f40c66a0a8c6ec7f6ec SHA-256: 3fc1bb3f6cf6c85c5a5cdd16546a78ecfb388fa9855002667b252c519f4cd505
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, with one heuristic identifying it as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the overall structure indicate a phishing or malware distribution attempt.

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://jacksth.ru/wb?keyword=indie%20adventure%20games%20xbox PDF link annotation
    • http://1xbet-football.fun/simikozinibefumiwexewadef1bp2.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/vufajuxodez.pdfIn PDF document text
    • https://veriketosamu.weebly.com/uploads/1/3/4/6/134675732/9442181.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419820/normal_5ffd0cf8d0892.pdfIn PDF document text
    • http://justamorem.com/zombie_original_recipe46ebn.pdfIn PDF document text
    • http://english-10.site/3d_driving_class_mod_apk_unlocked_all_carsffczd.pdfIn PDF document text
    • http://therarbooks.com/34638812278xdigs.pdfIn PDF document text
    • https://letateworu.weebly.com/uploads/1/3/4/3/134365764/junanabanezu-linorutadofup-nazixenobopo.pdfIn PDF document text
    • http://begdas.space/65601857061127ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384647/normal_5fef6d842f533.pdfIn PDF document text
    • http://graatorama.space/45178706071auxap.pdfIn PDF document text
    • http://50offshop.pro/79406840666lnslq.pdfIn PDF document text
    • http://hookup154.online/angelo_s_soccer_corner_columbiabalc5.pdfIn PDF document text
    • http://6gusevshop.website/jurassic_world_alive_1._16qpr5h.pdfIn PDF document text
    • http://hotloveme.online/lme_copper_price_july_2020tl9r3.pdfIn PDF document text
    • http://daliadiago.com/driving_process_improvement6rz38.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/dufekifaral/mafipen.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/37084897504.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/sqlite_editor_apk_speed_software.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/ancestors_the_humankind_odyssey_guide.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_off00010521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10521 5316 bytes
SHA-256: b863c60052efd051c03da98be920f622b399b096bc54df5ee871ea7bc0bd0b9c
font_01_sfnt_off0001172a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172A 10468 bytes
SHA-256: 5b48c794007655195566de80487d46fad953c90e36ec5148048be4c0c3f08415

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