Malicious PDF — malware analysis report

Static analysis result for SHA-256 634fcb90fb478d0b…

MALICIOUS

PDF

77.9 KB Created: 2020-12-30 04:35:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d6cf49b41b3fa47216827518fec027cb SHA-1: 08dd50ba301d32aad208b6c90affaa4f119fd9b4 SHA-256: 634fcb90fb478d0bedeeff08ed172d7d8db2869539128957c7ac35bf2c26f5f7
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external links, 'https://traffking.ru/123?utm_term=german+augmented+sixth+chord+solfege', suggests a potential phishing or redirection scheme. The ClamAV detection and ML classifier further support its malicious nature, indicating it's likely a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/123?utm_term=german+augmented+sixth+chord+solfege PDF link annotation
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/voreduko-sifari.pdfIn PDF document text
    • https://cdn.sqhk.co/duzemata/V4ooYid/luxefiregezatuvag.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/vinivuxo/lolugasefukurigapujix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e295cfc8-7d39-492e-854e-803d45d03ddc/zovukinoxomubom.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/carelink_professional_software.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/gobaxaboku.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/puresavobapazorugoremizir.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/71415302526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5b2296b-f501-4322-97b0-d6158b283b0d/90605686975.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19572668-b1e5-4a6e-b03c-b1f6f90b194e/2737145315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77242323-5ae7-4406-8d04-296ca8956a8f/41559343852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/423a2878-6c02-4eaa-af42-dfef8302db36/22686900365.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/bujedebewitesi.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/rodelopemukuduja.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3F 5532 bytes
SHA-256: 3bd7ad9411774f337567eb3fdf8e7ecceb8311e6e0a875ec9eb916a264303507
font_01_sfnt_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 10920 bytes
SHA-256: 4c57731cda6005d4ba70d89f5ea0f72c082d85b9208dfd50cb62b693300a85b7
font_02_sfnt_off00011588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11588 16120 bytes
SHA-256: 46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12

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