Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a0f05f0c5001786…

MALICIOUS

PDF

82.0 KB Created: 2021-03-26 07:08:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 688fe294abe16979f6058cc85ae6e2b3 SHA-1: a24a011da4138fadc5cb5fc50ccffc718bb59787 SHA-256: 0a0f05f0c50017868fbcb02491a042618da20a2d9f33e8b2d42c284aa32737b1
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=executive+summary+example+business+plan PDF link annotation
    • http://profyhouse.ru/46642863692tce.pdfIn PDF document text
    • http://naturebiolog.space/what_are_the_three_estates61jyq.pdfIn PDF document text
    • http://lasns.fun/22437376877bcbbu.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/hdjd0S2/pixexazu.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/i4BzXXn/semidifotetigabavak.pdfIn PDF document text
    • http://arendaavto.taxi/96882395828ov0d.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/gcRjjuj/amazon_addon_chrome.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d1e718d6-368d-4e36-871d-50e039471320.filesusr.com/ugd/89b1bc_361298c9e56346e5a838cc5b6e6ac4bb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jexijer/anonymous_for_chrome.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_24de5dc403f84dd08ba3f0dfdd6f0f06.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/assisted_reproductive_technology_art_report.pdfIn PDF document text
    • http://xubudexev.epizy.com/bararinunegitawanudukujel.pdfIn PDF document text
    • https://a3abd3d7-f7e4-4b0c-86b7-ec358d8c805a.filesusr.com/ugd/97a3b3_187321174ea0478299d9dd08c3808475.pdf?index=trueIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_e0469eb2cc034eacb5ec6d2d5164d3de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/filidabut/wadewedukixizeluzimod.pdfIn PDF document text
    • http://fuverojipu.rf.gd/zurusenur.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/dyson_ball_animal_2_vacuum_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/85487373402.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/ludemol.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_off000104ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EC 5404 bytes
SHA-256: b43c0c0cee1496167c14ad1a461ec3d8270354e8f8ea97d26cc00b3e7e7e66a3
font_01_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 10232 bytes
SHA-256: 08b03794c010d5a632652adb65a1d45ed3afd3db6cd6685acc594d88360fafd1

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