Malicious PDF — malware analysis report

Static analysis result for SHA-256 beaf6214d27c2cab…

MALICIOUS

PDF

71.4 KB Created: 2021-01-18 17:10:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8bb7dbe4c3ecc73a6ae9655f056371d3 SHA-1: 7446d507c3091c11701851a669564eaf7e990551 SHA-256: beaf6214d27c2cabc37d30207e7c2db0c4230d5c0532a053324d3ffd9ee6b3ad
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'seumenha.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host multiple links on disposable domains, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://seumenha.ru/123?utm_term=montag+fahrenheit+451+quotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444866/normal_5fa6cbb1bd21c.pdfIn PDF document text
    • https://site-1168117.mozfiles.com/files/1168117/guy_laroche_top_up_processing.pdfIn PDF document text
    • https://site-1177924.mozfiles.com/files/1177924/epic_heroes_war_hack_apk_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401989/normal_5fcb1e1158831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368500/normal_5fc3085d20347.pdfIn PDF document text
    • http://biduwupukipajov.22web.org/chrome_mobile_settings.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/jezaxojipevu/wolupatewenuradijajem.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/zejuzupuxumitilejuzi.pdfIn PDF document text
    • http://bobujosu.epizy.com/autotune_evo_vst_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/vesafowiji.pdfIn PDF document text
    • http://ferenekukosazu.epizy.com/traduo_batman_arkham_city_pc.pdfIn PDF document text
    • http://keputeka.epizy.com/android_toolbar_back_button_not_working.pdfIn PDF document text
    • http://jokiperone.epizy.com/xalix.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_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 5392 bytes
SHA-256: 444190974333d28303b2372cd2c26c29ac7172ac98a07bfd665eb22d62a82eb7
font_01_sfnt_off0000e854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE854 11936 bytes
SHA-256: faefe4f779ac95966ecd390b043ccbd02d653eb63f181043949a2d9aba35fcb1

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