Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9f81476c883f2f7…

MALICIOUS

PDF

66.2 KB Created: 2021-01-28 20:12:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 1ed8f0eff32743568b96777225d21008 SHA-1: 78ba2ede39fb67d9ccd69c7689306464e823287c SHA-256: e9f81476c883f2f73f35021822ab0ea64d6f61b3cd05a8cb916e885fcf58d289
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded links, with several pointing to known malicious redirector infrastructure and disposable hosting. The primary attack pattern observed is the use of a link farm to direct users to potentially harmful websites, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=ground+zero+airsoft+map In PDF document text
    • http://1xbets-reg.site/22693661961a77rk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450243/normal_5ff02d15a455b.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/hghgcti/etre_conjugation_subjunctive.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417123/normal_5fdfc7587ae79.pdfIn PDF document text
    • https://gusizamavuva.weebly.com/uploads/1/3/4/6/134629738/1002220.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/QUifmha/super_one_more_jump_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/LLghehf/xujexojusenip.pdfIn PDF document text
    • http://gobigs.space/legoxuguj57kf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506063/normal_5fd9125998cea.pdfIn PDF document text
    • https://boleturem.weebly.com/uploads/1/3/4/3/134398498/3a5bb6234a78d.pdfIn PDF document text
    • https://kisisixixugejo.weebly.com/uploads/1/3/0/9/130969502/vaviverorafobabijan.pdfIn PDF document text
    • http://letnesil.xyz/warofovovebitoloxapupidekef5cq.pdfIn PDF document text
    • http://5gusevshop.space/xamufobaxulojix5ty78.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/bQJHYd7/piano_music_for_beginners_free.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/goviwigax/femutigukurifilubofajuxi.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/90062145963.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_off0000c6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AE 5236 bytes
SHA-256: e57505118d8c030108d485607e8c076ab134aaebe0a20346b62052454ffa869e
font_01_sfnt_off0000d875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD875 10436 bytes
SHA-256: 1c5486e8134902cbe9bd5f8a404e00070122cc8ef119f8f9bdb8c5f2880f2d41

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