Malicious PDF — malware analysis report

Static analysis result for SHA-256 526c2713a4c4fcc6…

MALICIOUS

PDF

169.2 KB Created: 2021-02-19 06:41:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1b90894f266984fc6117ca63c786cc59 SHA-1: a51d6545edab5f9c39ff2eda3e69ffbdb664d792 SHA-256: 526c2713a4c4fcc6c6cecebf087f5df281178c00f5410823a4d93884d3ecd304
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It impersonates Microsoft to lure users into clicking a link, which is a common credential phishing tactic. The embedded URLs and the nature of the heuristics suggest it is designed to download and execute a second-stage payload, likely exploiting a vulnerability within the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://dabusoze.weebly.com/uploads/1/3/4/5/134585091/e03bb6.pdf.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://bologen.ru/wix?keyword=fortnite+guide+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413703/normal_6005b687c3410.pdfIn PDF document text
    • https://dabusoze.weebly.com/uploads/1/3/4/5/134585091/e03bb6.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/download_flight_pilot_simulator_3d_mod_apk_revdl5otvr.pdfIn PDF document text
    • https://cdn.sqhk.co/mugolino/khcich6/59912500249.pdfIn PDF document text
    • https://cdn.sqhk.co/kozuvurop/ighimia/earnin_get_paid_today_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/suxavawudomo/XXNg1ii/find_friends_iphone_12.pdfIn PDF document text
    • http://jazabezul.iblogger.org/avengers_endgame_trailer_isaimini.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/hji8uib/mavukavinaloxoveki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456985/normal_5ffd986e2125b.pdfIn PDF document text
    • https://cdn.sqhk.co/segenoliz/giGgiie/31993656828.pdfIn PDF document text
    • http://static-start.top/tigag0ld8f.pdfIn PDF document text
    • http://zzzmmmmejjj.space/honda_rebel_300_rider_weight_limit90qnf.pdfIn PDF document text
    • https://dorikorojuj.weebly.com/uploads/1/3/3/9/133987202/4557a10d8284b0a.pdfIn PDF document text
    • https://cdn.sqhk.co/lazimafuxuxi/jdUtvxd/saxew.pdfIn PDF document text
    • https://cdn.sqhk.co/nalomuxe/fUzjeq2/tifef.pdfIn PDF document text
    • https://cdn.sqhk.co/digatamale/hhibh6g/taguxutulegojojuwipep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5fd1b607cbaea.pdfIn PDF document text
    • https://cdn.sqhk.co/jepogedofuz/2hh9ggy/jutewi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rajemezipuz.rf.gd/5279396406.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_off00026072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26072 4948 bytes
SHA-256: 9ae6aa9b28f7b801bbd6d99ecffc9297f32e7c1d7acef9374a0e19f14daec3a8
font_01_sfnt_off00027160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27160 10840 bytes
SHA-256: 4d5db17509c501ae4bea8f6381d3e07e17a52f76bc9b574b5bea74d73d93f4fe

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