Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1d7d0b1256aeb0…

MALICIOUS

PDF

75.7 KB Created: 2021-02-20 06:05:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7292e0be51de2485d6bc27bd2dcc8984 SHA-1: 93d29eb9e7cc45af7582f5926fbfeea1257ff82f SHA-256: 8a1d7d0b1256aeb00ad270e00330cf4d438161b31d9de2d24fa999b36735126e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=what+race+was+mesopotamia PDF link annotation
    • http://wgathering.org/68752589030r5jyj.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxiwimemo/HgeVifJ/instagram_captions_for_guys_2020.pdfIn PDF document text
    • http://zewojapu.22web.org/dadalegowakuwonifimiruzu.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/joRgg4W/long_drive_game_wiki.pdfIn PDF document text
    • http://rocketdocs.us/smart_launcher_3_pro_apkpureb235p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366024/normal_5ff5640729c1a.pdfIn PDF document text
    • http://trells.space/41694289092pvil4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368747/normal_5fd38e4287b6f.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/cgcji9A/puzumixatobinosoma.pdfIn PDF document text
    • https://cdn.sqhk.co/sawitofi/cjf9MlG/idle_zombies_apk_mod.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
    • http://gatituz.rf.gd/61235871776.pdfIn PDF document text
    • http://bedegotix.epizy.com/vmware_workstation_15_serial.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_off0000df28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF28 4928 bytes
SHA-256: ac2be5878509bde02be7a40699d468027cc43904a2a2d32193fc9db1be062eb6
font_01_sfnt_off0000effd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFD 10640 bytes
SHA-256: a8e243e7b533080a69e6f5c4e9ef03f488a8f356379a9bea04b160e7ebdcb339
font_02_sfnt_off00011467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11467 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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