Malicious PDF — malware analysis report

Static analysis result for SHA-256 0271ac1d167f67d6…

MALICIOUS

PDF

69.2 KB Created: 2021-09-17 08:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 335bba3db717482a00f92bb42bf52e92 SHA-1: 651f417d1a929dd5b443398aaab5c681fe8e2102 SHA-256: 0271ac1d167f67d6ab70dc1d48eda6e5dec3a27cbacc983ae1025b34606da155
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, indicative of a link farm designed to redirect users to malicious content. The PDF structure and embedded URIs suggest an attempt to exploit users through deceptive links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://chcial.ru/uplcv?utm_term=forza+horizon+4+mobile+without+verification
    • http://autoscuolemontagna.it/userfiles/files/dumufozipa.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d35751e78942381f8b30eabe190896a5/baxaxededanoxarikotadarim.pdf
    • http://wsmr.us/userfiles/file/82918459331.pdf
    • http://kimura-shihoshoshi.com/userfiles/file/koxudasesujukuvaguvit.pdf
    • http://yonezawanet.jp/units/24250/zcycom/files/69245568566.pdf
    • http://susutour.com/userfile/file/62380977213.pdf
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/mupupabolobokig.pdf
    • https://dascalita.ro/app/webroot/files/userfiles/files/jamivovijusadulaj.pdf
    • http://pnalog.ru/images/file/venukosopowulojufes.pdf
    • http://gloria-eurex.com/images/blog/file/bumakizefafevufozifiv.pdf
    • http://potya.com/97143323431.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4ee009514---gexadapobewuxidegutig.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/5413395513.pdf
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/91430735737.pdf
    • http://orlickachata.cz/files/files/82223725128.pdf
    • http://airmon.hu/images/files/notuxizolemewepokap.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/masitulogusabexizatatu.pdf
    • http://laboratoriologos.it/userfiles/files/weperizoxu.pdf
    • http://xinxinhouseware.com/uploadfile/files/4580199788.pdf
    • https://bednidhitraders.com/userfiles/file/dazokero.pdf
    • https://radio-clipa.ro/userfiles/file/lojirufofavexekuza.pdf
    • http://marcth.pl/media/fck/file/xurenexabafar.pdf
    • http://familiegravesen.dk/userfiles/file/mededojokigukulitaxu.pdf
    • https://truongthanhco.vn/webroot/img/files/87406710153.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b142.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB142 16792 bytes
font_01_sfnt_off0000c959.bin
758e6e7b44a4db5f8549430c957f6b051bf92ecba1d84cc39fa25225d817f7d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC959 10940 bytes
font_02_sfnt_off0000e294.bin
134dc97034642d00c46b0371c1abc7d42cb16d839e15d69693775a6cf6a58a91		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE294 14664 bytes

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