Malicious PDF — malware analysis report

Static analysis result for SHA-256 7480852e37656791…

MALICIOUS

PDF

119.5 KB Created: 2021-09-16 17:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dda7a94384244d1e1725211f4a6b0b99 SHA-1: 9f73878dd4db617afb69b25b112b4e8c1ad768d7 SHA-256: 7480852e376567915b2882956e434e842c0a39a4545dcff4a1d96d712c5b26fd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or redirection scheme. The presence of external URIs and the ML classification strongly suggest this PDF is used to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://kqcme.yiaiwang.com.cn/upload/files/wasutiki.pdf In PDF document text
    • https://shen-su.eu/gfx/userfiles/files/50641652796.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/46640891648.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/vumuvixetuluguf.pdfIn PDF document text
    • https://harom.ro/files/file/22170825868.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/17439185246.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/40702074861.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/semoweke.pdfIn PDF document text
    • http://malifer.hu/upload/file/81083912841.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/44492066197.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/e8j2to28uuu6p8b75itj6urcgq/58969227737.pdfIn PDF document text
    • https://ever-progress.com/upload/files/sopuwubitaxupeso.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131434551f61---55716314851.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/20503200586.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/pepiguvawexe.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/2621796961.pdfIn PDF document text
    • https://rais.bg/uploads/file/44555402720.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/79708195560.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612f06fc2066f---purelalajowagimeme.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/69621536018.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/tadabikigobuluketut.pdfIn PDF document text
    • https://proia.bg/userfiles/file/73078943766.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/71950380752.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210907031620.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/68957436466.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/31285880757.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/lofiperiladelodanuka.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/8811345970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=boruto+159+onlinePDF link annotation
    • 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_off00016a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A90 10280 bytes
SHA-256: ed57a1a143c72f4dc7d1d6fb0c007e4045189447727d3eed3d97336074db7019
font_01_sfnt_off000181e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181E4 20508 bytes
SHA-256: cc8baee178fe3aff214daf216a0a79e1d8441551805c6853f5499b9680a7a590
font_02_sfnt_off0001b7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1