Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a713531984ee06b…

MALICIOUS

PDF

74.6 KB Created: 2021-05-26 04:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c05ba92c0b0b15104d68b0e049f53c52 SHA-1: 2c208b98f77cc8ba7a66b3bb3fe34da3345d9e15 SHA-256: 0a713531984ee06b4187aa3d5cc0960cac930251958618a3e41cdcd95ba3bf57
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files. One of these links, https://dafemum.ru/strik?utm_term=educational+psychology+doctorate+salary+uk, is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/strik?utm_term=educational+psychology+doctorate+salary+uk
    • https://mexekujiwununiv.weebly.com/uploads/1/3/1/4/131407761/6184205.pdf
    • https://kurebefa.weebly.com/uploads/1/3/1/1/131164205/gugorowog_lasiso_jizulezogadoxo_kirosupi.pdf
    • https://kofovozeregom.weebly.com/uploads/1/3/4/3/134313602/042fd6.pdf
    • https://kipowiginudi.weebly.com/uploads/1/3/1/3/131383469/d0875972ed55732.pdf
    • https://rovibabewovel.weebly.com/uploads/1/3/4/8/134884015/vewipuwatutese-savasivoja-nojusadekozuwap.pdf
    • https://kedaregedowe.weebly.com/uploads/1/3/5/3/135321867/jaxuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sajatesawodiji/libevudusikesu.pdf
    • https://s3.amazonaws.com/navoburarovada/hypo_and_hypersensitivity_related_to_autism.pdf
    • https://s3.amazonaws.com/farezelof/serowo.pdf
    • https://s3.amazonaws.com/vuliwisuwig/archicad_gsm_objects_free.pdf
    • https://s3.amazonaws.com/pirofopafu/que_es_liderazgo_transaccional.pdf
    • https://s3.amazonaws.com/vunizi/lycoming_o-320-e3d_parts_manual.pdf
    • https://s3.amazonaws.com/daraniwekamidir/11642835533.pdf
    • https://uploads.strikinglycdn.com/files/81b6d106-13b3-4e3c-a289-e743eca1da4b/52109022702.pdf
    • https://s3.amazonaws.com/tetofamuxulil/clinical_laboratory_science_review_lsu.pdf
    • https://s3.amazonaws.com/gotitibekovi/what_does_5d_mean_on_my_kenmore_washer.pdf
    • https://uploads.strikinglycdn.com/files/7cbbea41-668d-44a6-a546-5e9c93ef9bcf/directsoft_6_serial.pdf
    • https://s3.amazonaws.com/bipepezuwed/trigonometric_identities_solving_equations.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e644.bin
45004cb848e1b910afd8349b0f3ff3071f51b74f59afe3a867ef397286bc01e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 5456 bytes
font_01_sfnt_off0000f8d5.bin
3af2cf24051a04954f449fc343b3997ba186ac36d36a2071da06328dbb2bf28b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D5 10596 bytes

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