Malicious PDF — malware analysis report

Static analysis result for SHA-256 1020a6e550db2e56…

MALICIOUS

PDF

75.8 KB Created: 2021-03-18 13:00:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11c1ed71d9f98fd7784e212f7d777737 SHA-1: 99310c6bc21e9ac653399bf46aef6c3424deb6d2 SHA-256: 1020a6e550db2e563b82fc7405e82b3a8f18e708d426dff8a9fdc548eccea8f5
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, indicating a link farm or redirection strategy, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, possibly leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/award?keyword=tutorial+drawing+pencil+pdf
    • https://static.s123-cdn-static.com/uploads/4382201/normal_5fc96c222882e.pdf
    • https://static.s123-cdn-static.com/uploads/4482418/normal_5fc68eb8be4e0.pdf
    • http://kovezemunoropu.iblogger.org/pidilugemerojigadesokevib.pdf
    • https://cdn.sqhk.co/filodomazora/2hg7FNL/furokulobofulexosovef.pdf
    • https://static.s123-cdn-static.com/uploads/4484639/normal_5ff8c5afb4f8a.pdf
    • https://static.s123-cdn-static.com/uploads/4406464/normal_5fcaf764086d3.pdf
    • http://wemedimixodi.iblogger.org/935887487.pdf
    • https://cdn-cms.f-static.net/uploads/4481072/normal_5fd18c252c567.pdf
    • https://cdn-cms.f-static.net/uploads/4444353/normal_603128ac56fa0.pdf
    • http://rkconstructionsucks.com/ficha_tecnica_chevrolet_classic_1.4taxe3.pdf
    • http://lakabusomasa.22web.org/how_to_clean_ariens_carburetor.pdf
    • http://dkblogin-de.best/kugivizudotigogumitafoacaz1.pdf
    • https://cdn.sqhk.co/geruvijiwiw/gcid6DD/88125099820.pdf
    • https://cdn.sqhk.co/xuwadezab/UBhjA0C/39871698432.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sawopirorafo.rf.gd/crossword_puzzles_with_answers_for_adults.pdf
    • https://a68e2ff5-bf17-48e3-82d4-ceb975b85758.filesusr.com/ugd/760101_6398df3f280b4bef8d180089910a7dac.pdf?index=true
    • https://ad9f1622-e3b7-49db-bfef-326c48fb2104.filesusr.com/ugd/a467d2_8f5e1bbc4c284b3985af02528b6e5ad7.pdf?index=true
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_73c2fc5991c24013a58af67ac4fcd894.pdf?index=true
    • 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_off0000ecee.bin
78667305c6842f40d2281842018c352335e57bd2670402c491b46b4a5282d438		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEE 5184 bytes
font_01_sfnt_off0000feb9.bin
1a66f221a7cec6cb9af29d8fe968c754aa6dbf7ef945e3ba8b4dc063514dc825		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB9 10392 bytes

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