Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13a47d4ada13b2d…

MALICIOUS

PDF

65.1 KB Created: 2020-12-21 05:02:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b7165e819e7744b903ccdfdc459ace03 SHA-1: e68c804f57f4541c0fab4f66328621a3a08a2d53 SHA-256: b13a47d4ada13b2dea18bdf4b07fca25567d2106e3a9af17e23c7a2ce7377153
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, with one pointing to a suspicious domain ('trafftec.ru') and another to a potentially malicious PDF ('s3.amazonaws.com/wovitiku/debuxomigezat.pdf'). ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to redirect users to malicious content, likely for phishing or SEO spam.

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 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.
  • 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://trafftec.ru/aws?utm_term=multivariate+normal+pdf+matlab PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501810/normal_5fc725da5bdbb.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/sulusilalope-jobede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461509/normal_5fc3190b0ac6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f935bf519fbf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wovitiku/debuxomigezat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7b431e8-83e8-4a21-ad44-3bf31c9a0a41/waukesha_north_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8438c025-2050-4f86-8426-1a51d3fe693e/pevetogemudamisejejid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d35415ac-1350-45b0-b444-84e7fae86777/gitevunaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b685208-54f8-4fd1-b6c2-77a211075003/chemistry_semester_1_final_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52113899-8333-4f94-bc8c-451e9de56180/57243449956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb61e4b9-78c2-4479-9a73-4ff9a57dd2da/constelacion_de_orion_y_las_piramides.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_off0000bf2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2F 5212 bytes
SHA-256: bcec02fa5401eb8e708df58d198b864d3f61cc28f4039d3f280e47c357b76b20
font_01_sfnt_off0000d0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E1 10980 bytes
SHA-256: ceb5e4f5c1b37dd251f6a07d840380de8094233ef37ebb3d745d5d1991d83f80

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