Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d47db8efe14f1c…

MALICIOUS

PDF

86.4 KB Created: 2021-02-21 16:45:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9164877b69bb84fbc12191ea75ca607d SHA-1: 5ab5305425a4f012fdf54f1e86991daf0123fb80 SHA-256: b2d47db8efe14f1c8af45064534e240ed88919f33af59e4bae821ceb08ae1a29
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. 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 0.9998

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://leonvi.ru/strik?utm_term=how+to+cite+without+author+name PDF link annotation
    • http://fherixq.com/exercise_ball_abdominal_exercises8qvg1.pdfIn PDF document text
    • http://online-bestshop.xyz/51219574082v86db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420743/normal_6028c57d001ff.pdfIn PDF document text
    • https://cdn.sqhk.co/vizakifito/hjDmgb1/royal_princess_wonderland_runner.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/icmDigy/gun_fiend_aki.pdfIn PDF document text
    • http://kutufirix.iblogger.org/panasonic_phone_headset_model_numbers_explained.pdfIn PDF document text
    • https://rilobajivevet.weebly.com/uploads/1/3/1/4/131438099/3134928.pdfIn macro / runtime command snippet
    • http://biotringel.shop/what_does_code_f_mean_on_a_cabrio_washerh8nwj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_601469f492537.pdfIn PDF document text
    • http://kutufirix.iblogger.org/panasIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/80693709441.pdfIn PDF document text
    • http://pivujumurabaf.epizy.com/kifibosiwaf.pdfIn PDF document text
    • http://wajiletum.epizy.com/milipetix.pdfIn PDF document text
    • http://pebulibupa.rf.gd/el_arras_del_espiritu_santo.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_off00011593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 4884 bytes
SHA-256: 1aae9040265ef7cc39c0ab4744ba718adf4b1acfdbe53e9e2536a383fe7646c1
font_01_sfnt_off00012610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12610 11400 bytes
SHA-256: 61cc27391676aa598d377eacb581c4733595c0e8d7fdd930db4822593b63a080

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