Malicious PDF — malware analysis report

Static analysis result for SHA-256 de1089c30c9523b7…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 13:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b855fb1b3b83bc3a1f0d2959447d7d9 SHA-1: 9baa655c2126045652aa2a7e9b7471ce64eb63ff SHA-256: de1089c30c9523b7f5a39183999d23ea84cc814ee7cd23bb9ad61f32fe46fcac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs and is described as a link farm on disposable hosting, indicating an attempt to redirect users to potentially harmful websites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=free+mp3+downloader+for+iphone PDF link annotation
    • http://www.hydro-tg.pro/upload/file/lubaxujakazad.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/leporoviguna.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/38349331304.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/genevi.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/81379769346.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/fetazutokalewumexene.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/joxovibujud.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/sezor.pdfIn PDF document text
    • http://ombs.ru/uploads/files/gofidapodamefiwa.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/40729357346.pdfIn PDF document text
    • http://mueblesdepladur.es/1/userfiles/file/tonanoza.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/43293197059.pdfIn PDF document text
    • https://lorus.rs/files/78422471019.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/57729739045.pdfIn PDF document text
    • https://derfo.info/resimler/files/5544986767.pdfIn PDF document text
    • https://inprovitmexico.com/ckfinder/userfiles/files/ziliwomu.pdfIn PDF document text
    • http://merwepizza.com/upload/file/96650313881.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/50632558956.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jegugitokekawugekiz.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/tovarivu.pdfIn PDF document text
    • https://spyboarcams.com/files/26954067657.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/6503800224.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/sepapi.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/93099018141.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_off0000da85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA85 18064 bytes
SHA-256: 67162fb28372b81cbd0b20f3ecce84cf780420e44325f374bf1e9ae9b1a80bd6
font_01_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E9 10732 bytes
SHA-256: dc6365f50f56486ae427abbf9c88a800259ad98080cd3eda6eb601d721b53154

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