Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b084b53eafad301…

MALICIOUS

PDF

73.2 KB Created: 2021-02-24 01:09:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 413e1a0fce2ed98c890ad96a77632493 SHA-1: ea25c08509f1fe0d596d9f3603abe0dc595cafaa SHA-256: 2b084b53eafad3016c772683ebd94454f1a76db5b8803db09f995817e74c12a5
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic strongly indicate the document's purpose is to redirect users to malicious sites.

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://bologen.ru/123?utm_term=how+to+unclog+ac+drain+line+without+shop+vac PDF link annotation
    • https://cdn.sqhk.co/naxisedomak/SbZJMgh/rush_limbaugh_live_stream_app.pdfIn PDF document text
    • http://olymp-trade.top/82393792402s18ig.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/aAgjNnL/lesixuvesozitunabonaput.pdfIn PDF document text
    • http://zalavsky.ru/breaking_indianapolis_newsvpr2t.pdfIn PDF document text
    • http://azorocheat6.xyz/1356355744260bar.pdfIn PDF document text
    • http://operationhomeplate.com/accurate_battle_simulator_free12fg3.pdfIn PDF document text
    • http://it50discount.pro/23636380493eytg2.pdfIn PDF document text
    • http://helplnstagram-confirm.com/bemefux4vj9r.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/ejihfwe/diwamuwipiki.pdfIn PDF document text
    • http://com-signto5.xyz/champagne_formal_dresses_australiak3cuq.pdfIn PDF document text
    • https://cdn.sqhk.co/gawarebadal/6sBjeSF/xuravolipulexekuvox.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/WyVGAgj/mogeb.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/mogedozara/instagram_app_for_android_4._1._2.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/princeton_review_cracking_the_new_sat.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_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 5448 bytes
SHA-256: 8bcaaa167a4dabe1dd055b552f7bb7f0859f2c1ee9a76148cb52bfda7a033501
font_01_sfnt_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 10284 bytes
SHA-256: 7954867f6ab30dabaa08a6e139853609a86147fc78c22861062873076bb8c23a

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