Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd8e15a29b17f25…

MALICIOUS

PDF

73.6 KB Created: 2021-04-29 14:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9ae939f89f3a4ac38fed5d439221009b SHA-1: bd8ec5bf850638a746e0e55b62f1bdfdcd05bcd1 SHA-256: bbd8e15a29b17f257ea416b83d549cda2e7734d3476aed81055cb976f98ef404
186 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 0.9998

Heuristics 6

  • 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.
  • 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://lozipotod.ru/strik?utm_term=victory+services+club+rates PDF link annotation
    • https://verulezame.weebly.com/uploads/1/3/0/8/130814285/711d3.pdfIn PDF document text
    • https://nefixesuxu.weebly.com/uploads/1/3/0/9/130969456/6108401.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/haGjgig/diversity_and_inclusion.pdfIn PDF document text
    • https://cdn.sqhk.co/jolurakokulo/hbifngj/adobe_photoshop_7._0_free.pdfIn PDF document text
    • http://xakidofe.sportsontheweb.net/xetojepibunase.pdfIn PDF document text
    • https://xojumemusip.weebly.com/uploads/1/3/4/0/134018475/wupinenekeja-dekozixuko.pdfIn PDF document text
    • http://vuliduku.22web.org/jack_and_the_beanstalk_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kojariwirip/ujcCigt/difeta.pdfIn PDF document text
    • https://cdn.sqhk.co/polidupokasu/FzgcBjh/kuremuvafiwofuxi.pdfIn PDF document text
    • http://vekuzebis.22web.org/attributional_style_questionnaire_asq.pdfIn PDF document text
    • https://cdn.sqhk.co/budafitanu/haWgjhg/job_offer_letter_format_doc.pdfIn PDF document text
    • https://parukiwodisurup.weebly.com/uploads/1/3/4/4/134455528/680271.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/70d08402-22cb-426a-aa12-aabb77e3be91/plantronics_backbeat_go_600_over-the-ear_wireless_headphones_black.pdfIn PDF document text
    • http://koduwutuvage.onlinewebshop.net/26339296380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b686ab29-fdb8-4207-9d76-a9a21bc7c51c/mojotovimozexokajujuki.pdfIn PDF document text
    • http://nufuwulevek.epizy.com/applied_maths_3_kumbhojkar.pdfIn PDF document text
    • http://zirutabu.myartsonline.com/is_the_movie_the_book_thief_a_true_story.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_off0000df6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6C 5060 bytes
SHA-256: a4f5cf0ad3e3d6c4578e9e32f75a94c2ad33f64f70c32b2230917632760a977c
font_01_sfnt_off0000f0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C2 12124 bytes
SHA-256: 890404201dfe0cfd98fb32d9a49e19e0c6b253659e6271a7431462bf90f92962

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