Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de7d3cd0174e71e…

MALICIOUS

PDF

84.2 KB Created: 2021-04-04 06:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b38d063c55bea845152d7c8f781c0bfd SHA-1: 1fc211c75674d9a28a2d591accd235bef52b48cf SHA-256: 4de7d3cd0174e71e4bb10f5b825a6422d3a06ea498738091ee37a2fd2015edf3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to potentially malicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to download malware disguised as drivers. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://kuzutuzo.ru/strik?utm_term=driver+canon+mx300+windows+10
    • https://pegufozexak.weebly.com/uploads/1/3/5/3/135317465/8874279.pdf
    • https://zisusanizapan.weebly.com/uploads/1/3/0/7/130775047/pewaluvijodizovewuli.pdf
    • http://pipexob.66ghz.com/bahubali_1_movie_songs_in_tamil.pdf
    • https://cdn.sqhk.co/bitanalagep/qijghtC/xalawasekuvasojiliganobad.pdf
    • http://datulosuwila.iblogger.org/edital_policia_rodoviaria_federal_2013.pdf
    • https://denesibupu.weebly.com/uploads/1/3/0/7/130774977/2197018.pdf
    • http://bewepovuzif.iblogger.org/97395842259.pdf
    • https://wujipomazoki.weebly.com/uploads/1/3/1/3/131384492/muparewubexex.pdf
    • http://ziponep.22web.org/code_39_extended_barcode.pdf
    • https://cdn.sqhk.co/lomabufu/QIjhiay/wuwifixulabilozil.pdf
    • https://mixutuxo.weebly.com/uploads/1/3/4/6/134692071/48c802c89a9.pdf
    • https://cdn.sqhk.co/vulovosovem/TgeG7gc/xotekubotujemobivimur.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/63f258c3-cfc8-4260-a124-97371ddff904/xonotakosuselotubikon.pdf
    • http://lexuwusifo.epizy.com/59980018036.pdf
    • https://uploads.strikinglycdn.com/files/3f853a00-0a8d-4edb-99c3-86152d87fe00/xodumikojok.pdf
    • https://uploads.strikinglycdn.com/files/35e1b15e-a9de-43fb-93ca-3a6b5d2b7c67/printable_sentence_building_worksheets_for_kindergarten.pdf
    • http://deroselewem.epizy.com/paxidujotetasumeruwanuref.pdf
    • https://uploads.strikinglycdn.com/files/5b9b749d-bf44-4118-861b-fd4bae2d13c6/33484945613.pdf
    • http://nivitigu.epizy.com/nesakidixobagadawizoxajin.pdf
    • https://uploads.strikinglycdn.com/files/df50960d-2e96-481d-8438-e820990b1178/19918543744.pdf
    • https://uploads.strikinglycdn.com/files/8e55c5da-3306-4749-88b6-b8bdcd7b7b5a/bevuni.pdf
    • https://uploads.strikinglycdn.com/files/23a757ed-8277-4dd2-8154-5db8dbc4c73d/92803418020.pdf
    • https://uploads.strikinglycdn.com/files/8df03e26-451a-45d9-8b03-e740e8d903fb/how_to_configure_tata_sky_universal_remote_with_samsung_tv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010841.bin
96b411c42980bc8f9b9a68f70f1ac6969e205b18057d9ec9877e8ebfa6d5dbc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 5632 bytes
font_01_sfnt_off00011b75.bin
68177fb5916fbf918a6751e957c1188c6ecb39cd6e0e93aaba4e7eea2551c0b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B75 11340 bytes

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