Malicious PDF — malware analysis report

Static analysis result for SHA-256 416710b165dd8d2b…

MALICIOUS

PDF

78.2 KB Created: 2021-02-28 23:23:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ea5578388a754ed0cc227cc072cde59b SHA-1: f6fbc85d16f6e853f68b5405b8de1869bc068ca8 SHA-256: 416710b165dd8d2bc564f80fa22ba7ff646d82fc119f2e750659a93f9638ce84
146 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting and a callback phishing lure. The document body, though heavily obfuscated, suggests a lure related to a 'Suzuki book PDF'. The presence of numerous external URIs, many on disposable domains, strongly suggests an attempt to redirect the user to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/strik?utm_term=suzuki+book+1+viola+pdf PDF link annotation
    • http://serururepus.scienceontheweb.net/11860819358.pdfIn PDF document text
    • http://sebemigon.66ghz.com/33120151852.pdfIn PDF document text
    • http://amsidgi.xyz/nemurowalec5r.pdfIn PDF document text
    • http://raisinshub.pro/hp_9800_printer_flashing_lightsngr2z.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/iP91Chd/xabami.pdfIn PDF document text
    • http://xtina.online/lafotxbm3d.pdfIn PDF document text
    • https://sejixegagetuta.weebly.com/uploads/1/3/0/9/130969850/medenaxapanodubu.pdfIn PDF document text
    • http://womans30planet.com/what_are_the_different_elements_of_technical_analysisg1nsc.pdfIn PDF document text
    • https://cdn.sqhk.co/meduxemij/SqLPhhb/ghost_rider_fortnite_glider.pdfIn PDF document text
    • http://zahlungsservice-ch.site/wedding_cake_baking_gamesk9q8q.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/liar_s_dice_gamegvvwu.pdfIn PDF document text
    • http://uchebnoe.website/zugatokafebnztv.pdfIn PDF document text
    • http://trokot-newshop.online/barron_s_sat_math_23pwzr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kosejoviwo.epizy.com/diguxezokazekep.pdfIn PDF document text
    • http://jitawidavez.atwebpages.com/what_is_power_dissipation_in_cmos.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 5232 bytes
SHA-256: 7868b8a8b187983908fe3d943a2851418e5b95c917efb632eb43a34e62ab6a12
font_01_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 11268 bytes
SHA-256: 8e23c124a3cc7e5e16db0511c4674b3b376a2fbb9652f6b74b5a143da8bc8fb9
font_02_sfnt_off0001172e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172E 16060 bytes
SHA-256: bb4620ae2308066493f479cb0495314a41e91f5b0bfb2a754d9bad2ef34af03d

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