Malicious PDF — malware analysis report

Static analysis result for SHA-256 45a8ffda13f4d10e…

MALICIOUS

PDF

89.7 KB Created: 2021-06-10 20:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b41d1d314d8d3015c497c914032a1ef2 SHA-1: 55554dc33273d3ba351bdbf31e3a8116d1c199ef SHA-256: 45a8ffda13f4d10e98524bcc34d7adeb372b3330b33a5114043d702263267b25
186 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged as malicious by ML classifiers and ClamAV. The document body, though heavily obfuscated, contains text suggesting a lure for 'Beetv no ads apk'. The primary IOC is a URL that appears to be part of this lure, likely leading to malware or a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://wastran.ru/pbw?utm_term=beetv+no+ads+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390056/normal_60128e0a7822c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474988/normal_60267ca1e188f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501027/normal_5feb87893b50b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423728/normal_5ff6b15c8417d.pdfIn PDF document text
    • https://daxeteven.weebly.com/uploads/1/3/2/8/132814811/9917419.pdfIn PDF document text
    • https://zokefipevi.weebly.com/uploads/1/3/4/3/134311683/2384529.pdfIn PDF document text
    • https://luxexawasoju.weebly.com/uploads/1/3/4/1/134109261/98a0e4e.pdfIn PDF document text
    • https://verefatodefi.weebly.com/uploads/1/3/4/7/134722939/6500046.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449616/normal_5ff89dbe779aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409395/normal_6069f6ef56000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/6d81bce4-d3e5-4197-b597-918c02c47a37/96823868494.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd677490-9374-4f59-8f8e-a8bd2d146e61/jexumedumunivopidavupow.pdfIn PDF document text
    • http://pebegijopolo.pbworks.com/w/file/fetch/144761142/ragi_dosa_recipe_in_tamil_madras_samayal.pdfIn PDF document text
    • http://zinezukajawe.pbworks.com/f/pascals_wager_apk_obb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db0d0773-8a9d-4b0b-9c7d-a99ed900e59f/7256037124.pdfIn PDF document text
    • http://lewiwebula.pbworks.com/w/file/fetch/144647505/minecraft_apk_ios_no_jailbreak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a9e3680-4aef-4ece-837b-6a632762a422/pakibumazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04e56e07-0f3e-4f74-ad6f-5f8dc1da7f03/food_safety_temperature_control_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a607c1d-b9c0-40d5-8142-9d5c97bce831/ocarina_of_time_n64_vs_3ds_comparison.pdfIn PDF document text
    • http://tatetobegu.pbworks.com/w/file/fetch/145025673/dangal_full_movie_download_mp4.pdfIn PDF document text
    • http://redelaw.pbworks.com/w/file/fetch/144541449/manoj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 4736 bytes
SHA-256: 9718a54fa046a8d30e86060ec41a7ac30e60ab46f8ecef3fb3c92fc14df905fd
font_01_sfnt_off0001241d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 11364 bytes
SHA-256: 4dfead93a5217fb17308cba0bf1b38beccafb8dade032ea97d6830ee7367e7d7
font_02_sfnt_off00014b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B0C 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230