Malicious PDF — malware analysis report

Static analysis result for SHA-256 94396bd712a9f04c…

MALICIOUS

PDF

71.2 KB Created: 2021-02-22 07:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4019be963d891fccd19874667aea3464 SHA-1: 283011e0ed4c287ec245ff00f0af17c84cbad8d1 SHA-256: 94396bd712a9f04c11c591f2319c87b35979a2f9978e93acc11fd1e72cfa2deb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, suggesting it is part of a link farm or phishing campaign. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URLs indicate a likely attempt to redirect users to malicious content or phishing pages.

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://jacksth.ru/strik?utm_term=arduino+nano+pinout+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477913/normal_601024bc0a675.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/EQhiThb/naxogaxinazipinaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408476/normal_5fd7cf119302d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365598/normal_5ff32f0031c8f.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/ija4qho/bojepupipoj.pdfIn PDF document text
    • https://cdn.sqhk.co/xonafelog/ascjpjh/century_21_near_me_now.pdfIn PDF document text
    • https://linabodaku.weebly.com/uploads/1/3/1/1/131164293/kuberaturukupi.pdfIn PDF document text
    • https://cdn.sqhk.co/nugopanage/Jojgxih/video_game_wallpaper_hd_1080p.pdfIn PDF document text
    • https://gutusalewizewuj.weebly.com/uploads/1/3/1/8/131871657/278381.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/ijjbhaP/number_puzzle_3d_print.pdfIn PDF document text
    • https://cdn.sqhk.co/kasuwajavi/jg1FaRL/64674954720.pdfIn PDF document text
    • https://melinifijegor.weebly.com/uploads/1/3/4/2/134265386/bomasaze.pdfIn PDF document text
    • https://cdn.sqhk.co/diratukuz/fhhehht/blue_bot_robot_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 4812 bytes
SHA-256: 1541be992e961c4ac12bfe928f26072b2eda369f82b74bf79c2fabb721be5f5c
font_01_sfnt_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 10652 bytes
SHA-256: f07329e1a71ed323b91678dfc157d8ffd34f4105446810f462daddc58ef947c3

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