Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdedbae7b6d5213…

MALICIOUS

PDF

65.8 KB Created: 2020-12-17 15:16:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 650dedee5b06bf3e75f1e80f359b119c SHA-1: 90396e43dc8244f11396a0b923db042e2b7b7a6d SHA-256: 3cdedbae7b6d5213db17b672b46bd36d4fa50eb6036bcd1e5e2d177970054bd2
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it's part of a link farm designed to manipulate search engine results. It also contains an embedded URL pointing to a suspicious domain, likely intended to redirect the user. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

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://traffnew.ru/123?utm_term=what+is+a+river+jon+boat PDF link annotation
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/zozowu_kopogul_gomavas.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/dodafisetam-kilexus-vanagolidu-purufozedijiwi.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/besafefaf/rit_academic_calendar_2020_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e408420-833c-4287-9b17-acb11b538c7b/shrek_the_musical_vocal_score.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee7b423c-62c0-4f65-aa24-f9a16b190f3f/ielts_writing_task_1_general.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36ef4c1b-ed64-433d-9d51-8a3bb7150c51/jdm_toyota_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54c978bc-cd64-490b-892d-138c53a34fda/panbai_bhajan_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81c77ef8-5abe-4bf3-bd1c-21f5bdf6ee54/leather_peep_toe_booties_black.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/952eb95e-26d8-4b59-b38d-f602aed0086d/muzadem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f678b35-4ef0-4826-b2e3-692072c87096/xirew.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/95781116599.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/61168575959.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/importance_of_auditing_financial_statements.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_off0000c696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC696 5028 bytes
SHA-256: 5f8fcfbc8de1cfab6682253621b098f3175149c87f97c2baec8a7805bbf1f715
font_01_sfnt_off0000d7bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BC 10316 bytes
SHA-256: 9f7e32964fe9aeef6e27865cecca72aaaa47539e566d563da7f228f2b8583231

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