Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50fb2aaa7d893d8…

MALICIOUS

PDF

75.3 KB Created: 2021-02-23 20:06:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 002036b26d6088f3c75f0aa0ce0382d4 SHA-1: fc374a4fd1c0fdeeb60930047e89435ee6017c96 SHA-256: e50fb2aaa7d893d8d45f2adfc7814fa4f5e340dc58c636513a714c3315fc2814
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a 'warning letter for harassment' lure, reinforcing the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jottigo.ru/wix?keyword=sample+warning+letter+for+harassment PDF link annotation
    • https://cdn.sqhk.co/jegamaxegev/j1iauij/survival_battleground_game_download_apk.pdfIn PDF document text
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/6fdc4b532e7c7.pdfIn PDF document text
    • https://pasezoxe.weebly.com/uploads/1/3/5/3/135347718/texobutadujip.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/6740838.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/jZQgixk/95398419343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380382/normal_601b92e741324.pdfIn PDF document text
    • https://kigovedinefetup.weebly.com/uploads/1/3/1/3/131384362/xomopifefikevete.pdfIn PDF document text
    • https://mobisikude.weebly.com/uploads/1/3/1/6/131606420/ruzulewasiwewinegir.pdfIn PDF document text
    • https://rokubupudila.weebly.com/uploads/1/3/1/8/131856034/34dd7a3dfeb.pdfIn PDF document text
    • https://bafizotadax.weebly.com/uploads/1/3/4/7/134761596/889c893b.pdfIn PDF document text
    • https://sunakolezapomuj.weebly.com/uploads/1/3/4/6/134698053/48c90a.pdfIn PDF document text
    • https://ribiridoxa.weebly.com/uploads/1/3/0/8/130874248/1465020.pdfIn PDF document text
    • https://cdn.sqhk.co/bepoweruga/dmhaKhd/slow_motion_maker_download_free.pdfIn PDF document text
    • https://mejotowud.weebly.com/uploads/1/3/0/9/130969644/fd66b00d4d79146.pdfIn PDF document text
    • https://tiwapopo.weebly.com/uploads/1/3/0/7/130739059/kirabuveme-xujoxadukixam-tusaxexexibewol-vigoforotamow.pdfIn PDF document text
    • https://betixajivuf.weebly.com/uploads/1/3/4/9/134900014/nutubiwil-jerizoxon-kitapebu.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/nademopor/zunuperutanimosuna.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_off0000ea71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA71 5512 bytes
SHA-256: 7433e6f47fd6143a097ea8510844028d7af67c0eb75b44a98c95097baf7dd502
font_01_sfnt_off0000fd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 10212 bytes
SHA-256: 2c048b29b6cad49795e682532474e2b991ff807e2be6d73d277aefe1fb73d701

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