Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b36e9a5b3ac6de…

MALICIOUS

PDF

77.8 KB Created: 2021-04-23 09:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5ad8c3db0670ca6f925b9df4e7080067 SHA-1: 5b6f24b33044c780d89e7aeffa403bf208599a40 SHA-256: a7b36e9a5b3ac6ded3cf070a30acce31d94763460feff6562a335c334208d094
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, many pointing to disposable hosting, and uses a lure related to a popular textbook download. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy on disposable hosting, suggesting an attempt to distribute malicious content or phish for credentials.

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://pelibifir.ru/strik?utm_term=a+world+of+ideas+10th+edition+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409256/normal_5fff3a3d4cfb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481819/normal_6023109746e3c.pdfIn PDF document text
    • https://cdn.sqhk.co/navuwamas/ifsgduW/sunflower_maze_near_me_illinois.pdfIn PDF document text
    • http://leravuviwipolox.iblogger.org/xemulofirozi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484610/normal_5fc65a5b3604a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_602a1a2fbe7e6.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/esja5ow/boat_driver_salary_uk.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/gixipemeguvibunil.pdfIn PDF document text
    • http://vajesafosedepur.mywebcommunity.org/jitolifubun.pdfIn PDF document text
    • http://joxitikoki.getenjoyment.net/92213029459.pdfIn PDF document text
    • https://cdn.sqhk.co/bilexodofose/b1GKl3m/dowexidogelixusujoxodu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449768/normal_5fc73cadd48c4.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/IjbtRb1/fighter_air_combat_mania.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lokuvutifinulef.rf.gd/how_are_syncline_folds_formed.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/bourne_identity_soundtrack.pdfIn PDF document text
    • http://leparitupoxow.onlinewebshop.net/paracetamol_aines.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/tuxokimutafivadif.pdfIn PDF document text
    • http://jipopoj.rf.gd/macbeth_literary_terms_glossary.pdfIn PDF document text
    • http://sodowurivav.onlinewebshop.net/34546293327.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/root_mean_square_error_interpretation.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_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 5404 bytes
SHA-256: 8834aad52a7d762495c1b2202dcfa9c82551f5b24c19ee6ceb062ab428e3284e
font_01_sfnt_off000100f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 11668 bytes
SHA-256: 92bdce1a1a6c8f43059fca9cd4ef1023971cc616c541ea77a303e8ba16ac2e72

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