Malicious PDF — malware analysis report

Static analysis result for SHA-256 899a081daddc0efc…

MALICIOUS

PDF

90.8 KB Created: 2021-01-15 14:44:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: bc3097c42678281de793f9813f638c27 SHA-1: 70fef21e5891e859779c9c97e6ce2abf6d879318 SHA-256: 899a081daddc0efc5eed42a52d37d09e4dcd13a0c0b87335ecfd06957bb7d458
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of numerous external links, including a link farm detected by PDF_SEO_LINK_FARM, suggests a phishing or SEO poisoning attack. The embedded URLs likely lead to malicious content or further stages of an attack.

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://traffnew.ru/aws?utm_term=algebraic+structures+textbook+pdf PDF link annotation
    • https://gemiletux.weebly.com/uploads/1/3/2/6/132681217/807122.pdfIn PDF document text
    • https://site-1168112.mozfiles.com/files/1168112/tutorialspoint_assembly_language.pdfIn PDF document text
    • https://sugokumorol.weebly.com/uploads/1/3/1/4/131437576/xuvawa.pdfIn PDF document text
    • https://wuwuxetu.weebly.com/uploads/1/3/4/8/134897280/9205275.pdfIn PDF document text
    • https://zonanasuwovu.weebly.com/uploads/1/3/2/6/132683154/meluxawef_rizasunujikat_pisafejekide.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/zufaxepixiguxax/dstv_ghana_tv_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/88893388342.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/for_honor_aramusha_advanced_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/12681449152.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/15597055051.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/11381943923.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 5584 bytes
SHA-256: 739d9b0e18befb45b68f31a699b4f8a5e0c7b6f99fe0e4af5f6779f2b5fb0639
font_01_sfnt_off000117f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F4 15144 bytes
SHA-256: b43e5cdd889434f33f2507a8ce770b8e8d2959d34b9df49f2df291197b17738f
font_02_sfnt_off000146bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146BC 16680 bytes
SHA-256: ed218328e425066c9e8a0bd4916f4f91de2704fe33fcdbe3b4cac52326890e93

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