Malicious PDF — malware analysis report

Static analysis result for SHA-256 15efcf2dff77907d…

MALICIOUS

PDF

73.1 KB Created: 2021-01-13 11:53:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 38609eb6dc95ef21231e89e4ae6351ed SHA-1: 7a1f41d749fc592c0ef3b38eff5d99b7436ffafd SHA-256: 15efcf2dff77907da88b5b36e3998d111e90d04f3fb6d1e58a5c6f9f1926807b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

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://trafficel.ru/123?utm_term=bis+2a+discussion+manual+answers PDF link annotation
    • https://cdn.sqhk.co/salenasova/hgo9h9a/93088805769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5fd2447d5a25f.pdfIn PDF document text
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/3440429.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/jfgfgdz/zofelanigonujexoputida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467017/normal_5fa77eca80fe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465685/normal_5fa97e1cd0388.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420245/normal_5fc83bf502f61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384628/normal_5f8ce1483c000.pdfIn PDF document text
    • https://site-1178448.mozfiles.com/files/1178448/panik_butonu_izle.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/fadadedezeker/improvement_exam_2018_date_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/premabhishekam_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/ketinunasalujobisanozago.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/spider_man_2_carnage_fight.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/64131484357.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_off0000df02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF02 5356 bytes
SHA-256: b1eb4d0c3bce169ae38b2f5b34029180c0705bf566ff1ebd45467b3a90368139
font_01_sfnt_off0000f138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF138 11256 bytes
SHA-256: fcc9f0cb93d7ec76b085e678a4fd75ea9baa772b8f0b5fded450de8119b876b7

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