Malicious PDF — malware analysis report

Static analysis result for SHA-256 d574750dbfe36e37…

MALICIOUS

PDF

71.0 KB Created: 2021-01-02 17:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 71434f7185fe454d5ef195b7ccb38b99 SHA-1: 9cbd75edeea4d2fe1315bd9b74346e5f098b34e9 SHA-256: d574750dbfe36e37c2d92e876b73f70dce315566a9049274e95435091334bdda
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://traffset.ru/123?utm_term=the+american+republic+textbook+bju+press PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456378/normal_5fe39b5b786aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379968/normal_5fcdeff7ef244.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/ladudojupavaluw_tabupewaluximex_befopobudofi_murewujotewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413583/normal_5fdbb4ca6fec4.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/T6Yibii/gameboy_micro_for_sale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454430/normal_5fd63f42679e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452594/normal_5fa01e1437257.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462066/normal_5faaf43356030.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/d3038598-7927-4b6f-a473-cdc47af3f0d6/xodewutusojesiwuwirawen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e95e42af-7312-4403-ac56-db5c2f678486/math_coachs_corner_number_sense.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60673588-260f-4d20-9d1c-9011c66dd29e/wolfgang_puck_mini_rice_cooker_mac_a.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/48434623807.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_off0000d8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AA 5472 bytes
SHA-256: 15784d99e59e5072e47b9163e34dd4b654071b92db4583f711336b4638bf8961
font_01_sfnt_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 10460 bytes
SHA-256: 6891c967ed4ee071cfd4fd3c7962291017de17085c72bd6d224840b19575f036

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