Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d667bb35aebaf1a…

MALICIOUS

PDF

79.3 KB Created: 2021-01-14 06:22:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 64b779d044a0bb22d73b47a4e5433a87 SHA-1: b6fde6371a2b8b3e71d6353ce6f7c91ed0abfd07 SHA-256: 9d667bb35aebaf1af9c1b6efb62e4169465041928baf056dfaef712a3e864826
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with a primary suspicious URL pointing to a site that appears to be a link farm designed to redirect users, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains references to game downloads, suggesting a lure to attract victims.

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://trafficel.ru/aws?utm_term=grand+shooter+3d+gun+game+apk PDF link annotation
    • https://site-1166680.mozfiles.com/files/1166680/voriguxitelexowevelifape.pdfIn PDF document text
    • https://site-1247964.mozfiles.com/files/1247964/ratotekibin.pdfIn PDF document text
    • https://site-1173925.mozfiles.com/files/1173925/7602396348.pdfIn PDF document text
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/954659.pdfIn PDF document text
    • https://site-1178662.mozfiles.com/files/1178662/8682616381.pdfIn PDF document text
    • https://site-1174658.mozfiles.com/files/1174658/free_robux_hack_no_human_verification_or_download.pdfIn PDF document text
    • https://site-1174882.mozfiles.com/files/1174882/24990469061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381344/normal_5f90b260ca6a2.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/8279107.pdfIn PDF document text
    • https://rosivitowa.weebly.com/uploads/1/3/4/5/134590356/5772105.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/tujeviwakirawu/usp_guidelines_for_bacterial_endotoxin_test.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/bhairava_background_music_ringtone.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_off0000f8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EB 5600 bytes
SHA-256: a5c6b8822ed986400c147bd788016e927937686e2092853e874513b411c8d1c8
font_01_sfnt_off00010bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 10816 bytes
SHA-256: 93da06b4948cf8d12dc4255a4f83cd1e483fdd810ac744156bc2eef1d5290433

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