Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbc0d8052b7708a…

MALICIOUS

PDF

73.1 KB Created: 2020-12-25 15:17:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9b6820272d208285fc994b67851c97a7 SHA-1: e98d7baf293878bc2ac6b8d6b98988dd1b4278d0 SHA-256: dcbc0d8052b7708ae7a628a00f792f297a25def5e23aaa17ac632077fab36efb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffine.ru/wb?keyword=rusty%20griswold%20christmas%20vacation%20quotes PDF link annotation
    • https://kirewigofe.weebly.com/uploads/1/3/4/3/134382955/ff423938999.pdfIn PDF document text
    • https://jezukiporewuge.weebly.com/uploads/1/3/4/6/134649506/27e37997.pdfIn PDF document text
    • https://kakituku.weebly.com/uploads/1/3/4/5/134589995/bonadizufapijuga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478683/normal_5fd6d7b91a979.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385204/normal_5f9c4fc70770a.pdfIn PDF document text
    • https://jipuzalo.weebly.com/uploads/1/3/4/6/134693454/kudoboxak.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/phf2Hgd/basketball_shooting_games_unblocked.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/40ae5085-fb2e-40f8-b9c7-1938d0d156fd/bowekilezukukilenajibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aac6481b-7623-424d-bd95-b0bad5bf3fc4/dukiwulunavo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a006d47-4de7-417e-8836-3884f09d371e/lasalle_council_bsa_org.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd2b6edf-7980-4824-b84c-faaf65b435dc/why_buildings_fall_down.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d1b8b2b-20fb-46e0-b511-e80528e21129/wupajemabirelotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ea4337-f61c-4f5d-8af2-a567a5c38ed2/40249437392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0401f8b2-e2af-43aa-b9c0-21a8432a08e3/naruto_shippuden_episode_107_english_dubbed.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_off0000e1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E3 5740 bytes
SHA-256: 64197b3bfff1d5343ba4358dec97e8329d0d7ba6813629a73a48a768317099b3
font_01_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 10028 bytes
SHA-256: 639d9ae313727f19f31720c7c734f1b249d97df387d7b03ccdb33500d1482cdf

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