Malicious PDF — malware analysis report

Static analysis result for SHA-256 c402a4310e52d17e…

MALICIOUS

PDF

67.1 KB Created: 2020-11-13 13:52:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2444ade8829ea8c6360acebd71c482c9 SHA-1: de603a9d6f867cc6ae35ecd0b7bccaa1c771ab3d SHA-256: c402a4310e52d17e9b9eccc6e6d6ef63067a9264340697a3dfb04ce1545b1f9b
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://trafffe.ru/123?utm_term=watch+jersey+shore+online+season+3 PDF link annotation
    • https://sanuvexugivi.weebly.com/uploads/1/3/1/6/131606490/1517711.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/wowabaxisefidet-nikuvajekibesim-napoxalapa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374360/normal_5fa3e0fb5fd4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_5fa1f56db2c6d.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/9c4b1f5e-e85e-4652-bfde-fcc374eca798/50344361707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f27acc9-2e9a-4f85-ae47-0cfcb85bbaeb/nguyn_vn_thiu_nguyn_quang_lc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1060dc7-66eb-4512-8f98-3b8443c6b7d1/45686516766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/647635c1-06ea-46e4-8a9f-6dde72476bb8/vexudagugubixogijoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f03528-2f2c-47bd-b837-fd8a660de709/36688641547.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/garden_of_salvation_loot_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9526f25b-7ab4-4256-afbf-192f67c7f43c/mercury_throttle_control_assembly.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_off0000c896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 5240 bytes
SHA-256: c5daace302e2d2a3abaf287afeac9c6f18ea011624fc4cf0d519b2d5e9f82754
font_01_sfnt_off0000da7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7E 10920 bytes
SHA-256: ff881db1713e0fb86328b009d40f6fad175fbd080ee858d6428ac8ccdacc4fa1

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