Malicious PDF — malware analysis report

Static analysis result for SHA-256 6501452432e29f8c…

MALICIOUS

PDF

83.2 KB Created: 2021-04-04 06:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a20a9d09d79b714308b8b2d0c5e84ec1 SHA-1: 7f377889b22295d0fe0fe26b760703c461fb3568 SHA-256: 6501452432e29f8c74138c9cb008996c05dd4b1311c641abcad75f36abfffacf
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to SEO-optimized redirectors. The primary URL, 'https://seumenha.ru/wix?keyword=frontgate+com+ez+bed+sheets', is identified as a high-risk SEO link farm and a lure for free downloads, indicating a phishing attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/wix?keyword=frontgate+com+ez+bed+sheets PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449992/normal_603b6e898a759.pdfIn PDF document text
    • http://secret-empire.ru/aarhus_city_guide5pnhn.pdfIn PDF document text
    • http://straponartist.com/namilevexaf7b.pdfIn PDF document text
    • http://sentytld.online/text_structure_worksheet_1187c35.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490121/normal_6008a1c48380d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412593/normal_5ffd361856699.pdfIn PDF document text
    • http://tesocoin.online/nikibogiratl52y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366633/normal_6056e1cddc220.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mogujuku.epizy.com/setoxos.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/tidivafonijipexu.pdfIn PDF document text
    • http://tikijot.epizy.com/ripemazojadikaj.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/40434858761.pdfIn PDF document text
    • https://s3.amazonaws.com/widofafane/butterfly_wallpaper_pagalworld.pdfIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_24f00fa7272047e0a3141d795588d8fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xabalaru/luxusaxikikazezil.pdfIn PDF document text
    • https://8ed7ad90-0d0e-491f-9c15-1f6cd5a61d18.filesusr.com/ugd/f1a804_ca4e55e2ac8d4540b0fe54fb8d438d3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/golepe/answers_in_genesis_120_years.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/7_spiritual_laws_of_success_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/fringe_complete_series.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/accenture_digital_twin.pdfIn PDF document text
    • http://gedilemusotatem.rf.gd/trk_eitim_sen_aday_retmen_kitab.pdfIn PDF document text
    • http://nozamoto.epizy.com/leratuligusozunabe.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/1237856443.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_off000104d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 5468 bytes
SHA-256: 11da9fa8d59d8ea6d6444408cb9a2ca7bd529a3b3fef730192e207574ba9f57b
font_01_sfnt_off00011740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11740 11376 bytes
SHA-256: 02326bf277dfad6822ea2aac8b6ad9a3fcc15f60c06b467e6e44d33fddea381c