Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9e328c68dbd52a…

MALICIOUS

PDF

74.4 KB Created: 2021-06-03 21:21:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b89edc67c260dbb73d766b6b2e2fe6de SHA-1: 1f5e9056de850e02db6cff6dab0624faaf2a4d5a SHA-256: ae9e328c68dbd52a8fa6c03bb41058548d3bca608701543a4d00437d2cfb39b1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on directing users to `https://crysiq.ru/pbw`. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` indicates a pattern of using disposable hosting and link farms, suggesting a phishing or scam attempt. ClamAV detection as `Pdf.Phishing.Trojan` further supports a malicious classification. No scripts were extracted, but the structure and embedded links point towards a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://crysiq.ru/pbw?utm_term=what+season+does+ian+get+better PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379220/normal_600b045176ab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477655/normal_601e37b761a37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374835/normal_604b2c063c752.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481509/normal_600398aec9c28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472774/normal_6036d741ccbdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490274/normal_60b8818ca5665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451018/normal_600a2132d0f93.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://viluxese.pbworks.com/f/deweratumogotup.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/tewubaxuwi.pdfIn PDF document text
    • http://xugilip.pbworks.com/f/38284745122.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9f59982-0974-4250-9aef-c32de6bed513/83655628633.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43aaf381-c81f-40c5-9460-93b77e72a035/ketono.pdfIn PDF document text
    • http://dejulagimu.pbworks.com/w/file/fetch/144565830/bonuno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb88330-0b5c-4c5b-8802-6188e01dc739/ben_10_alien_force_3d_game_free_download_for_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1f43329-0899-4abc-9223-eecc64f68649/90551138979.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/paxuz.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/f/gewuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/759aa77e-aa1b-4b39-b376-49c6bf6e1ea2/25588913096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a41c2144-922a-4dff-8c35-8bdb106c02fa/nozifojoximipiliw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7479a88d-d4ec-4f57-b621-b74496e9d863/rbse_class_10_math_book_english_medium.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3217135-e063-41c6-b855-d2aa28063cfb/what_is_the_word_contempt_mean.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_off0000e8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BD 5208 bytes
SHA-256: e2dedb434ed77ddec34b9373f21d64b017574c8f8d11c0fd2d2c563317a6b5fa
font_01_sfnt_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 9904 bytes
SHA-256: efaede081fc16445b2558dc801f929013785c9437b598114b8e2590fc53951ac

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