Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4e05f8015d4be8…

MALICIOUS

PDF

76.3 KB Created: 2021-03-25 03:59:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2ee78a1e8c19fc66ed23ed19d9302c7b SHA-1: 7b0a7cfee4007af00753bc9ca0401b13896ea6c8 SHA-256: 5a4e05f8015d4be8434b884ccf3b8495891cc20d47b4c036215a01d4d4fdee16
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated and appears to contain metadata related to 'Assassin's creed conversation symbols' and the wkhtmltopdf application, but no clear instructions or narrative.

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://fokemale.ru/strik?utm_term=assassin%2527s+creed+conversation+symbols PDF link annotation
    • https://jadekida.weebly.com/uploads/1/3/4/3/134349878/zogixeduvexoz.pdfIn PDF document text
    • https://cdn.sqhk.co/gixobujikelu/geuRhgU/online_bidding_auction_sites_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/derebeduno/gcijZhi/gem_mineral_show_2020_denver.pdfIn PDF document text
    • https://mudulavodeg.weebly.com/uploads/1/3/1/0/131070753/lusas.pdfIn PDF document text
    • https://peruvapi.weebly.com/uploads/1/3/0/8/130813059/madazokaziku-kurogajen-xugibabovo-jituxol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401525/normal_5fedd049e702b.pdfIn PDF document text
    • https://pimapavidi.weebly.com/uploads/1/3/2/7/132740410/2baa04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461746/normal_604e4a7a62fc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464082/normal_6033a9d98b36b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_60271c5a02cd7.pdfIn PDF document text
    • https://vepoxiwoja.weebly.com/uploads/1/3/1/1/131164136/d95096668defd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404122/normal_5fde9db3d9a9f.pdfIn PDF document text
    • https://jopekaraxawil.weebly.com/uploads/1/3/4/5/134589640/donasajepubalazatese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471234/normal_6017530f4da55.pdfIn PDF document text
    • https://fomodaduvi.weebly.com/uploads/1/3/4/7/134700625/gibosusadaduk_wokanegavixik_nowise_pagubetetavinuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_d410fe0418f141dbbdf74f83b0552382.pdf?index=trueIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_1c945ff1e73347afb46462871b31899f.pdf?index=trueIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_16735010fff04f8e88d4d8783d5102df.pdf?index=trueIn 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_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 5408 bytes
SHA-256: 6ba5e7df77f0f647395e0b3633698b4e9d6de222d1827fe569d39f9c210d5d59
font_01_sfnt_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 11288 bytes
SHA-256: 0df2dad8cee2bfa131a692922ac6199429255f22fe41425bfaf87023e9478f94

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