Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1c2ee86e96c04d4…

MALICIOUS

PDF

65.0 KB Created: 2021-03-20 20:06:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cd0f75a24804a99184d9eef78e8b88f2 SHA-1: c4a7c7433aada2d8e8f0efb10ce19d63580a82b3 SHA-256: f1c2ee86e96c04d4213e54f9b90f46fed20d6a16e812aaaa57e9d492b8af6ae7
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://dafemum.ru/wix?keyword=principles+of+economics+answer+key+8th+edition PDF link annotation
    • http://pankreatitum.ru/futodoxivedumuw54bvk.pdfIn PDF document text
    • http://manaluw.iblogger.org/vajov.pdfIn PDF document text
    • http://tuzotumefakorok.scienceontheweb.net/83120577265.pdfIn PDF document text
    • http://profibrend.ru/xosavalip0m652.pdfIn PDF document text
    • http://naxajogilelog.medianewsonline.com/vozetibofezula.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/xarojapi/anatomy_trains.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/religion_in_sociological_perspective.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/69210963029.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/3464937514.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/kalepewadovedowejamu.pdfIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/keganowowonajaperevamajom.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_1867694181df467eb1633e8cc08ca1c6.pdf?index=trueIn PDF document text
    • http://sabasil.epizy.com/baber.pdfIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_6f5c3b4661c441c5921eeee8a0848c1d.pdf?index=trueIn PDF document text
    • http://tokukemojitiwil.epizy.com/congruent_triangles_worksheet_answers_key.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_off0000c103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC103 5848 bytes
SHA-256: be27a272d43e093005011fc8b156db922b3ec2c2c46276d6d682385a6c9d4c08
font_01_sfnt_off0000d4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D6 9944 bytes
SHA-256: 79d80bfa16f8291dfcfe460d1d0c36624c51bff35ad1d5ebbe2a9104ed5fcef5

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