Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a1c9e4f3e3fc1a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-13 03:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0bfa7d165ccd0e5d9336263a1975361f SHA-1: faab308623670e9870273aecf317b92ced49ad41 SHA-256: b8a1c9e4f3e3fc1a35b5ac64cd915f8035c4be05529fbe0d7d351f8d90d46d39
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. It contains numerous embedded URLs, with one notable example being https://coretry.ru/uplcv?utm_term=law+and+order+svu+s22e16. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://coretry.ru/uplcv?utm_term=law+and+order+svu+s22e16 PDF link annotation
    • http://poptheme.cn/uploadfile/files/20210902_070508.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/rijelov.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/fesozesufuzut.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/wujopozegog.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/xuzajofezetikedaz.pdfIn PDF document text
    • http://htwy.com/upload/file/88421266014.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e48c2b40a5---vawofozexedatesumumofopol.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/zigetezepoxoza.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/74180630913.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/2905136449.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/11458780080.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/62890996010.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/lakebikuxoxe.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369b747e5ab---91802852117.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/wivodaxokowiretoboduge.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/mudufurapekarubeli.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/bunefenu.pdfIn PDF document text
    • http://ihdbd.org/upload/files/bupanorivojunus.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090710080973499.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/lujosek.pdfIn PDF document text
    • http://hexindechem.com/upload/files/fonuxijuribetif.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/melekipifazozagovipif.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/xedumoxumebe.pdfIn PDF document text
    • http://bdsductri.com/upload/files/18258850099.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_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 18552 bytes
SHA-256: 0935c93a17624dd8e5e16eaa0d34192ea32f2ca17bbd3a6c9bf6e549c8599b00
font_02_sfnt_off00011d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D55 10556 bytes
SHA-256: 5278be24079cbe360b72a9f00712cff64db70e32b717ab00302ed77e2357e8d6

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