Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb64e0bfc47d4770…

MALICIOUS

PDF

80.8 KB Created: 2021-02-16 00:20:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 92cf4c4d163651d93fa9622a6a841ee6 SHA-1: de7d0a4ee7a94de394d1d0fdfb4838296f3d09ca SHA-256: bb64e0bfc47d477009134f0d4f9788c72b80896fa0979d582b35b824bd22584b
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The primary malicious URL identified is https://baarspo.ru/strik, which likely serves as a landing page for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=integral+de+arcotangente%252F1%252Bx%255E2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374957/normal_601b9ce1efcc2.pdfIn PDF document text
    • http://leftoutclub.com/bodyguard_movie_all_songs_pagalworld._com24cek.pdfIn PDF document text
    • http://hurleyshamburgers.com/466877179256lark.pdfIn PDF document text
    • https://cdn.sqhk.co/mapelimujeku/fVgijxZ/train_conductor_world_hack_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403129/normal_5fde63f294508.pdfIn PDF document text
    • https://cdn.sqhk.co/pifajaloro/iYhaPmV/70301233920.pdfIn PDF document text
    • http://topsale.pro/8636371228cb2vj.pdfIn PDF document text
    • http://bestgirl69.com/480480444183prxe.pdfIn PDF document text
    • http://b4shop.icu/74125574312c76cr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476126/normal_5fcc736971f26.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/xidazeze/invincible_deaf_kev_piano_sheet_music.pdfIn PDF document text
    • http://ninonasoligu.rf.gd/rizokuwezijiwodutoted.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/favawemar.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/2643447827.pdfIn PDF document text
    • http://waraxiv.rf.gd/fake_medical_certificate_australia.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 3960 bytes
SHA-256: 5548970b2cf02a1b745a141e2a3ecdfc1793d624eac86bdb4eb0bad734c3881b
font_01_sfnt_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 5204 bytes
SHA-256: f5478c5cfe56e795e26b3fe8a6acea09d3f81afff271aa832eab507bec752cee
font_02_sfnt_off0000f504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF504 12716 bytes
SHA-256: da2edc60920256798432f77135eb2f041a0bf5fc1136b5bf17417368aefe3bc7
font_03_sfnt_off00011f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F82 16292 bytes
SHA-256: 9654f53460cef6a060865bf0fec0417a523c03cdb2e3372bf43f7bc715d89bf7

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