Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc0074e8ce417d8…

MALICIOUS

PDF

79.3 KB Created: 2021-02-23 05:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5496a261430a8ae9ba3d7c9bd65f2b55 SHA-1: f024aabee698279c5aa43e957effbc0ac760eb3d SHA-256: 3bc0074e8ce417d8f717fdf7f4db1042c3ea7397a7bfb002f40d8c991dd0b3a8
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, appears to be a lure related to a game, likely intended to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wb?keyword=4%20pics%20mystery%20level%2010 PDF link annotation
    • https://soguleta.weebly.com/uploads/1/3/4/3/134305846/dikipojirigi-xejelinovi.pdfIn PDF document text
    • http://centerbluebadge.com/96308898720ru8kd.pdfIn PDF document text
    • https://kusafowagu.weebly.com/uploads/1/3/1/8/131871480/9587018.pdfIn PDF document text
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/weziguw.pdfIn PDF document text
    • https://ralerafuzirepob.weebly.com/uploads/1/3/4/3/134386916/2719707.pdfIn PDF document text
    • http://iclod.tech/fadinapipotefokxbsw.pdfIn PDF document text
    • https://wofexajolevesi.weebly.com/uploads/1/3/5/3/135302186/5737d.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/EShiH2V/36027799173.pdfIn PDF document text
    • http://bella24.xyz/nivokitadzawpk.pdfIn PDF document text
    • https://kesesitevon.weebly.com/uploads/1/3/5/3/135317357/labufudigubo_kedalegizujevi_ruxepalizegipej_dukonewosuzejeg.pdfIn PDF document text
    • https://melitefikexaj.weebly.com/uploads/1/3/4/3/134315726/detokusax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_601386e16be32.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/xisefowu/spider_man_marvel_game_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/90268273211.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_off0000f770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF770 5220 bytes
SHA-256: bf3540acd8865ac8c39af4888e9284ccf3fcb608f84eaa5c35c162accf70adcb
font_01_sfnt_off00010935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10935 12580 bytes
SHA-256: e6d4fc11ed57eafb7539821604775610e165ba22cdb96528fbce33a566efd557

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