Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d18f6eaa95132e…

MALICIOUS

PDF

80.7 KB Created: 2020-11-18 01:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 02b6dd13e42f46281cf5e077b9fd193a SHA-1: db56418562b6f4844e208e4baea8f6fdce1a0f4d SHA-256: 43d18f6eaa95132e383f90214a92545cfffed58a71bf7457e8720bb43bd2f596
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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-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/123?utm_term=robotics+competition+2020+near+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5f89165c2b7d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_5fb451e796291.pdfIn PDF document text
    • https://talowitutujuf.weebly.com/uploads/1/3/3/9/133999148/nasibosakeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_5f990a7ecdcf7.pdfIn PDF document text
    • https://bilafewutugu.weebly.com/uploads/1/3/4/6/134619215/foxukapazudi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbab26f0-c6b3-4cfb-805c-ee2be96b622d/88595031991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f54d9eed-3c29-4557-bb20-40ed95ccb301/xconfessions_vol_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a6b31fe-e9d5-44b7-995c-b5e58ed73125/40990765589.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/109b0820-c25b-4de5-8ba4-0079efa6bfd2/dog_shedding_like_crazy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/601aed91-95a8-4276-813b-a442484b26bc/bagikulalet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63be4009-5287-4337-92ef-a4fd063cb8e7/severe_weather_worksheet_geo_180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e175d05-b541-423d-98b4-070b318ead82/44199284639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d488aa-813e-40a8-9fa9-bba364f0bc00/lixilowusebuxedid.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEC 16072 bytes
SHA-256: a2323027746943de06830fb178e0075914bb863386dff320d11aad49c18a3320
font_01_sfnt_off0000fc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC83 5468 bytes
SHA-256: a92a0e26dbe9125767b6daff86c6a37c47802285f89c3897248140f664745b39
font_02_sfnt_off00010f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F00 11340 bytes
SHA-256: 39491f5ce1e330e4b7e96614545f5bca77dd64c6dbb39f96c87a9e866c0309d9

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