Malicious PDF — malware analysis report

Static analysis result for SHA-256 8839cb8eebfc0738…

MALICIOUS

PDF

79.0 KB Created: 2021-04-04 20:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e9c6bfaea60cdfa7ab2cfdd8ac51e486 SHA-1: 20a8f60af0a6e7672062c7e8ec0530682c991146 SHA-256: 8839cb8eebfc07385aea8765ba632d308c57d98df25102e1fac8200c2eea486c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one specifically pointing to 'baarspo.ru', suggesting it's designed to redirect users to a potentially harmful site. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm designed for malicious redirection.

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://baarspo.ru/strik?utm_term=marvel+movies+in+order+amc PDF link annotation
    • https://cdn.sqhk.co/susojareb/DagjUPN/87484480578.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505363/normal_6031d16537273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481520/normal_605887863d40a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416299/normal_603b96f323fe3.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/Bv5TifZ/farm_animals_in_spanish_translation.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424036/normal_5ffcb9c5bfabf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405660/normal_60045098f1910.pdfIn PDF document text
    • https://cdn.sqhk.co/zagakobafot/CHCXhbz/street_race_fury_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sukurorezib/PijYlIV/36628394249.pdfIn PDF document text
    • https://gareketekefebon.weebly.com/uploads/1/3/4/6/134695024/18a2e196.pdfIn PDF document text
    • https://tofexozulemun.weebly.com/uploads/1/3/0/9/130969243/27ac105a71538c.pdfIn PDF document text
    • https://cdn.sqhk.co/lanasido/jdSzeji/32009423277.pdfIn PDF document text
    • https://zuxaminuxux.weebly.com/uploads/1/3/4/6/134652083/6561466.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rijemow.onlinewebshop.net/sorry_not_sorry_naya_rivera_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b138e415-6db0-4b88-bd08-203371f3bed4/qlikview_tutorial_for_beginners.pdfIn PDF document text
    • http://jekurur.atwebpages.com/radio_astronomy_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1c2516c-c311-4b65-82c0-7b18b1dae73c/76129790716.pdfIn PDF document text
    • https://8b62b971-d575-4461-ae89-9de7a2afac08.filesusr.com/ugd/c5a911_326d70b6a8a643d0a26e09fcada7e980.pdf?index=trueIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_66b10761dc154648b9c37440c5e9bbf6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a20cfab-c121-40e6-ab6d-ed0b5f466cc4/46493142029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c1530f7-ae4a-4042-ad18-cf6f9d40c203/porter_cable_fn250a_owners_manual.pdfIn PDF document text
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_d33544ab60994f2e8980332ec08d8f14.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_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 5152 bytes
SHA-256: f9ac12b3044f7aa33de35bcd73b89b5bd1893328a5ef6dac137d7ba4716f7639
font_01_sfnt_off000105aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AA 11628 bytes
SHA-256: 002758763477a755f53125b2b1d5511900cb956727853ecbfdc8ae941253c27d

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