Malicious PDF — malware analysis report

Static analysis result for SHA-256 68bb40e81cbfa5f9…

MALICIOUS

PDF

75.8 KB Created: 2020-11-25 02:17:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 4d2347804f52216b741a6da00fdd8042 SHA-1: d1e6c4b03c49c339d4c6858fcfe6e182fa852b05 SHA-256: 68bb40e81cbfa5f93009164797a784d072761106364eea3bba1b4e7a5f1f7fcb
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary URLs extracted is 'https://traffset.ru/123?utm_term=march+2017+sat+reddit', which is suspicious. The ClamAV detection and ML classifier also indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were explicitly extracted, the nature of the link farm suggests a phishing or malicious redirection attempt.

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://traffset.ru/123?utm_term=march+2017+sat+reddit PDF link annotation
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/gipis.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/606b6.pdfIn PDF document text
    • https://menaxogem.weebly.com/uploads/1/3/4/4/134432074/suluwuxot.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/kipiluxen-fabumusumolu-zujuw-gafuk.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/e40efab4-a437-4b2e-a01d-4881c0d8ba5d/jusidejidozaveg.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/saxipezixuzelabe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fc9de27-c219-4463-9f9e-df05bc356e8f/94346381507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b578931-cf63-4cc7-8742-f60abccb9ab9/imgsrc_ru_contrasea_bypass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90993c30-a90b-4d4c-9db2-3208872a3329/93465301278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2547701-9154-445a-9f78-d6e39f455cf9/lafamaleledofoja.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/61613875926.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/kutegodikawevusekasite.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d7ed694-1983-4004-a643-f2dd0720e9f5/pinch_pot_animals.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_off0000eae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE8 5408 bytes
SHA-256: 515c13d39a28dfc8209049888c5f3ab32ab10905feb50cbb8deca556c4b3b1ad
font_01_sfnt_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 11184 bytes
SHA-256: 98b0f0172c8c1532c02a9e8866b4c8e49892c5b9802ba1e9a2d5ff94d9b7b4cd

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