Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3e60e981b93740…

MALICIOUS

PDF

87.4 KB Created: 2021-09-18 00:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9fe4485fbe0cbc13b4b854e329ba436a SHA-1: 35d5ed21eeaddf83f922de2f7e507094c2e51124 SHA-256: de3e60e981b93740d1ecd2cf253322c39ffbded5f508e669085725f552876a35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of links on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=auto+battle+android+games PDF link annotation
    • http://biznesfishki.ru/files/userfiles/files/91386590928.pdfIn PDF document text
    • http://krupongs.com/images/file/68479004683.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/gixejuterageteko.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/nafalesiwetodakife.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/23111887650.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/9426947756.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/zulibomebixadefuduxa.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/wuzijulovisadakivivirozi.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/nasimurujegenezuponof.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/dexegisuxuj.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/zunilok.pdfIn PDF document text
    • http://corkpotters.com/images/20320405857.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/39675134381.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/xenojorepag.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/paxogo.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/49720430577.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-10/20210910014712700653.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/34563340775.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/weros.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/dafizopodoxebesi.pdfIn PDF document text
    • https://redac.ch/upload/62197346032.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/zapabiva.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/93157558638.pdfIn PDF document text
    • http://josquin-capella.de/download/20182696079.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/22374359221.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 10812 bytes
SHA-256: 58c0a598323ebd956c7a97c431ef6eacc8a0a0dae8633d94f29fec55ed1e9639
font_01_sfnt_off00010b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B79 17172 bytes
SHA-256: ef8e09f0a2883e5e9030c4a50155b8048cfbb5c4a0dab8688fc44b1b01dbfc58
font_02_sfnt_off000137ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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