Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fad6f3027b8050…

MALICIOUS

PDF

72.3 KB Created: 2020-11-18 18:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: c16d046400f1f1b1d026256d88b991e9 SHA-1: d2eb9340a4fa6a0d89a3fec070f1dc6e54248bf9 SHA-256: b6fad6f3027b805083e615abe3a929ae90cd6ecd201a324f2815b12892e29717
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/strik?utm_term=principles+of+virology+volume+1+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5fa9a5a66127b.pdfIn PDF document text
    • https://porimejonawi.weebly.com/uploads/1/3/4/3/134368737/7bda7f3c2b22a0.pdfIn PDF document text
    • https://nixofukotozawe.weebly.com/uploads/1/3/4/3/134313466/6410223.pdfIn PDF document text
    • https://lezunodukulo.weebly.com/uploads/1/3/4/3/134341823/guzikorikifikesilak.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/d6eb0f20e.pdfIn PDF document text
    • https://zulebesawezule.weebly.com/uploads/1/3/4/5/134589138/8247230.pdfIn PDF document text
    • https://vuvajufuzuno.weebly.com/uploads/1/3/4/4/134480129/dd0d272c6.pdfIn PDF document text
    • https://japosazononugad.weebly.com/uploads/1/3/4/5/134583509/971a36a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_5f908303e6fa7.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/fedufiporara/steel_armor_blaze_of_war_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/rewam.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/unit_4_progress_check_mcq_ap_lang_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/red_newt_winery_new_york.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_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 5480 bytes
SHA-256: 6fd683646f8e7f8b80ba451300af732762ca49e91f526edb027371356762adc7
font_01_sfnt_off0000edfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFE 11256 bytes
SHA-256: 1505ab86dc92c79790e6a0adedf33e095b996467d3deb821b9761edfdbf4b628

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