Malicious PDF — malware analysis report

Static analysis result for SHA-256 01b4c4e9d5a2400e…

MALICIOUS

PDF

74.8 KB Created: 2021-04-01 02:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d151610a215aae5dc66e2da660b09efa SHA-1: 1180638a943a918c3d98654d47d0beab21dee93f SHA-256: 01b4c4e9d5a2400e496e92bf77a5852ef4488f4138e8f3340aa5129249353ac2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('resalured.ru') that is likely part of a phishing or malware distribution scheme. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, suggests a lure related to 'Bahtsul masail nu pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://resalured.ru/award?keyword=bahtsul+masail+nu+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447466/normal_602c3b753ab1e.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwufupi/Cabvgji/pugeworidebi.pdfIn PDF document text
    • http://iblack.space/41159638019j8g23.pdfIn PDF document text
    • https://cdn.sqhk.co/xemugugafot/aGihhan/weren.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446645/normal_5fe9ea1b21fb0.pdfIn PDF document text
    • http://fonagifegelu.iblogger.org/94651845663.pdfIn PDF document text
    • http://sedouche.xyz/53923326860f4943.pdfIn PDF document text
    • http://kokofiru.22web.org/classroom_jigsaw_puzzle_template.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/ihiggee/quick_video_recorder_background_video_recorder.pdfIn PDF document text
    • http://gokojun.scienceontheweb.net/lofubil.pdfIn PDF document text
    • https://cdn.sqhk.co/kipasewimoni/XBFiczG/game_dev_tycoon_ios_guide_sliders.pdfIn PDF document text
    • http://bejawutipage.mywebcommunity.org/limafepasudida.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_26d40c92159848369c92cb2d77049d4f.pdf?index=trueIn PDF document text
    • http://wokolutomi.rf.gd/pufobe.pdfIn PDF document text
    • http://rozazidugo.epizy.com/zifuvukupaku.pdfIn PDF document text
    • http://nipetemazoxiveg.rf.gd/gugamofapokakemu.pdfIn PDF document text
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_5c68bf09685a4d808e5246780eab0a28.pdf?index=trueIn PDF document text
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_254f7600dbc845ad82ddd2ddd727e825.pdf?index=trueIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_38ba046f53174d8c99fbcdafb7429a6f.pdf?index=trueIn 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_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 5236 bytes
SHA-256: 234a96890a118e0e328f5bc17b249c73917e94e3ac6438baee44d586d2bbcfb4
font_01_sfnt_off0000f9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D6 10620 bytes
SHA-256: c5811ba04b3ee5cd7eab066fffbcc8c0ed9142fd6ecf2f89d2ee8674cd3138a0

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