Malicious PDF — malware analysis report

Static analysis result for SHA-256 6835bd48f37ed63d…

MALICIOUS

PDF

64.0 KB Created: 2021-04-20 21:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a411b0ddcfe4b35490bd9752ee1e229 SHA-1: db96f32b0edba3be750d768632d112a79314253e SHA-256: 6835bd48f37ed63d19417450d0cf238e8f2ab1e475436f2149a810a0be9ccf47
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.002 Malicious File

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URIs pointing to disposable hosting, likely to obscure the ultimate phishing destination. The ML classifier's high output score and the ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9487

Heuristics 4

  • 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
  • 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://midufefew.ru/strik?utm_term=jamaican+clip+art PDF link annotation
    • https://porovepo.weebly.com/uploads/1/3/4/5/134527374/b84a5ab8d.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/eYjigil/tojatubovisa.pdfIn PDF document text
    • http://sikovagaxuwe.22web.org/pusivoboruwoma.pdfIn PDF document text
    • http://ririrukonexiliz.iblogger.org/fuditakezorox.pdfIn PDF document text
    • https://cdn.sqhk.co/rifusofuwedi/ficiage/kerilus.pdfIn PDF document text
    • https://tulivugid.weebly.com/uploads/1/3/4/6/134607321/lajasoxutusoso.pdfIn PDF document text
    • https://cdn.sqhk.co/gobonuzuwif/jSLAk5m/free_popping_bubbles_game.pdfIn PDF document text
    • https://dirukarizudabi.weebly.com/uploads/1/3/2/3/132303081/4090896.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xilibosukotijob.epizy.com/28200099332.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/56804934908.pdfIn PDF document text
    • http://zoruvalumupubi.rf.gd/67046889681.pdfIn PDF document text
    • http://suvofaga.rf.gd/78308844404.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/65815352046.pdfIn PDF document text
    • http://karatufi.epizy.com/jezanemitabaguzojom.pdfIn PDF document text
    • http://vowurosato.rf.gd/inflammatory_bowel_disease_articles.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/sixonopek.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/best_business_card_mockup.pdfIn PDF document text
    • http://roninifuwevol.rf.gd/25686268530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa34a910-e60c-4a20-9f8f-0fc75a1a613b/fipafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb4cc7f-6cd1-49b8-9140-a856caaf67a3/mathematics_textbook_grade_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0edb2ee8-b1a4-4d62-8523-9c0d9e7edd05/how_to_pair_plantronic_bluetooth_headset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf4682fa-f315-4c9b-b9e7-ff0c6eac4b88/2415473212.pdfIn PDF document text
    • http://nemebikox.epizy.com/sql_stored_procedure_tutorial_point.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec0e.bin
47e551ba6bfd3d3a224904250a40bc95b30570c27482907af414cd09e82a15c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 4892 bytes

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