Malicious PDF — malware analysis report

Static analysis result for SHA-256 6402e2efb198ccf3…

MALICIOUS

PDF

68.2 KB Created: 2021-03-31 13:39:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d8dd60de72ffe65dfe3ec32c28c5fbba SHA-1: 8eb199dadefed94f4e4b9119e087f297f958cd27 SHA-256: 6402e2efb198ccf3ef47e1c7e73bda1c8ad4242815b3c4b242bc6132adadd3ac
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with `https://soxebez.ru/123?utm_term=font+awesome+calendar+icon` and `http://mesretly.xyz/sazowutozuvarobegenld9ng.pdf` being prominent examples. The PDF structure suggests it acts as a link farm, directing users to potentially harmful content, consistent with phishing or scamming activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/123?utm_term=font+awesome+calendar+icon PDF link annotation
    • http://mesretly.xyz/sazowutozuvarobegenld9ng.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464072/normal_60289f8adb004.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/GicH6s8/kukojumojuvatidum.pdfIn PDF document text
    • http://pixxel.life/duzideniravijilidukage5sok3.pdfIn PDF document text
    • http://sodamasagu.66ghz.com/nonajufiverenumag.pdfIn PDF document text
    • https://cdn.sqhk.co/vumajotiwog/WjeuLYX/32463968269.pdfIn PDF document text
    • https://cdn.sqhk.co/sunaxidida/Oczlgio/how_to_draw_sea_monsters_step_by_step.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445130/normal_5fd7c6bde0d81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490523/normal_6041e3e21390a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452839/normal_603c04e4143e1.pdfIn PDF document text
    • http://apsmall.space/chicago_style_citations_guideqsgg7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393362/normal_600149d38cc3b.pdfIn PDF document text
    • http://abwaab.su/61599020857tpakw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454990/normal_60146cce65e9e.pdfIn PDF document text
    • http://org-fruit.space/rofulosaepzz6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409619/normal_5fe2c81699f22.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://masusekokuberex.rf.gd/varumavifewowepuputet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59C 1920 bytes
SHA-256: 189ac33ca4bf3b132b980cb531bdbe518c2fd08d9503536874bef726c4225252
font_01_sfnt_off0000ce37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE37 5132 bytes
SHA-256: 11eb7486c1fb8d31678490405f4283422cfa343820e4a51b1599277d63a672de
font_02_sfnt_off0000dfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA8 10432 bytes
SHA-256: 3a5f617e5c139e57c8296fcb1a4b49f75554287178c5aa1a0cc9af01caaae9bf

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