Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b495633724059cf…

MALICIOUS

PDF

75.5 KB Created: 2021-05-17 11:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b33bb9a82e0b08e7c6f6f1e5d5a876ad SHA-1: aae7e8aa8dc0961e840c89bd5e0b120f1979fdcf SHA-256: 0b495633724059cfaf4e3e367bb310aac82d655d2eb7f684b167889cfb503224
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'baarspo.ru'. The document body, though heavily obfuscated, suggests a lure related to 'Agricola revised edition rules', indicating a phishing attempt to trick users into visiting the malicious domain. The presence of multiple disposable hosting links further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=agricola+revised+edition+rules PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368477/normal_60251c982ca06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404108/normal_60247fbbea4d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450641/normal_5fe276df7017b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484363/normal_5fe3380d2a28d.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/bimugom-keluruk-liwokuke.pdfIn PDF document text
    • http://dawaliwiji.22web.org/peduvefo.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/bXmgc3k/stickman_tennis_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386092/normal_5fdcb96ac224a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475995/normal_6032e62dcbc89.pdfIn PDF document text
    • http://czecheducation.space/ccdc_23dwauf.pdfIn PDF document text
    • https://cdn.sqhk.co/solalokazili/hhakjc6/go_fish_poke_bowl_calories.pdfIn PDF document text
    • http://prodson.fun/2284312991nmggy.pdfIn PDF document text
    • https://lorobewan.weebly.com/uploads/1/3/1/8/131871486/958f2a00aa2.pdfIn PDF document text
    • http://copalofa.site/self-_absorption_definition_physicswh089.pdfIn PDF document text
    • https://tuvitewolejuxow.weebly.com/uploads/1/3/4/6/134615754/1db2e5.pdfIn PDF document text
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/pawotagezolinut-nabadoxubijevo-gilezujago-xupasaveluju.pdfIn PDF document text
    • http://prizyivnik.ru/hp_photosmart_eprint_wireless_driver_downloadjmgcy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pepiretivixu.epizy.com/algodoo_manual.pdfIn PDF document text
    • http://pinakebe.rf.gd/ultrastructure_de_la_cellule_vgtale.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_off0000e874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE874 5156 bytes
SHA-256: 842fee641b425978d9f94ce4cd95ef32175d7846244bd73fec666d656df7da4e
font_01_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 11616 bytes
SHA-256: 36c373ff0ab0698114e7430247f225a34e2ebdad62a75fbd7db381a64c2f8f1a

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