Malicious PDF — malware analysis report

Static analysis result for SHA-256 d398df9f6c91a681…

MALICIOUS

PDF

60.7 KB Created: 2020-11-20 00:29:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 4f1dfd22ea4148fa4ea2f04b83586e89 SHA-1: c4e8085492b3ae086a3315c7b3ee80f086678f46 SHA-256: d398df9f6c91a681e8e796a1c605bc6f4ec5481ef58ce44a4b240fc777eb8712
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://cctraff.ru/123?utm_term=fallout+76+leather+jacket+reddit In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5f8731fe4b124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_5f9ae2c975a53.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/ab6cb592-f70c-4d6b-b9fc-a8cb281acf86/longest_fart_record.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9c469a6-6f25-4401-a1cd-5ea3d9f3fb51/15204694895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c8bebda-f61e-4077-8e38-15ac0f6e2e6a/temaguzituvav.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/56777712175.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/fiwusibolosemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/924c48a3-5e16-416c-8102-48986469dadc/84095788241.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/doodle_devil_unblocked_games.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/355fe525-c936-4af2-b101-c0323be660ec/20263848057.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_off0000b192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB192 5180 bytes
SHA-256: 9dd51060b49616df95e9c6b4df3f626908a3e0ba2505ea2b4f472bda04d56581
font_01_sfnt_off0000c335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC335 10304 bytes
SHA-256: eaddbac0ccfe0e4999becddcbd8d0ac7fe3ad42ce83f770895c44cd62f0a6f41

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