Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd86edbf8ec92642…

MALICIOUS

PDF

76.1 KB Created: 2021-04-25 10:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2513922567b78c620fc7562e49ff7b61 SHA-1: 22c7a1724249f9df8cd126099ec94aa90e5090ba SHA-256: cd86edbf8ec9264200dea9e42a79f671af7876e885bb7c0d59a8db6b9281bebd
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://xezojetit.ru/strik?utm_term=how+to+check+transmission+fluid+level+2010+chevy+malibu PDF link annotation
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/9587764.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464530/normal_602b41f3156fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419206/normal_5feb501f4e9e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366043/normal_5fcd32b31e3bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_600e603705886.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409797/normal_5ff5e9a4d02c3.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopijaku/g3Hidpt/whirlpool_self_cleaning_convection_oven_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368485/normal_5ffa9302c7d93.pdfIn PDF document text
    • https://cdn.sqhk.co/vexorikodo/chfgghf/bewars_cinema_naa_songs_ing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403673/normal_60240b23cb7de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_6033b7863d84e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390381/normal_5fc8e9332bab1.pdfIn PDF document text
    • https://dawifebenunu.weebly.com/uploads/1/3/4/3/134374742/nufarirawezilufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470526/normal_5fdc1a77f410c.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/1UhbNh8/soccer_hero_hack_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444622/normal_605bdc9b48c64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459319/normal_5fca848b15a7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450041/normal_606e9d4741c33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413363/normal_606830b3972a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392462/normal_6052da846f196.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/vesubodufisi/which_of_the_following_is_a_good_example_of_a_thesis_statement_for_an_informative_speech.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/jaxivisuwesav.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_off0000eb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 6004 bytes
SHA-256: 94fdc9975f0b2420e7aa082a81d0e9d21d91b70ee225c99bc9aec2ccba2135bc
font_01_sfnt_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 10076 bytes
SHA-256: 8b1546a40c9240108cabb40a4b96c53fe2880a1cbf4bca8de06d2128fb3427ac

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