Malicious PDF — malware analysis report

Static analysis result for SHA-256 969db3c2b7232d63…

MALICIOUS

PDF

82.4 KB Created: 2021-09-20 13:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 569ec84c76e6c28fe7bf33fba1ce1fa7 SHA-1: af75a7e93d35e4160f97493b4ae3f4c07ae915a9 SHA-256: 969db3c2b7232d63f47a34d07f93521e96e0bceae3627333ab7e964f9642b7d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 disposable domains and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

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 http://pillshop.ru/uimg/files/10647130028.pdf In PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/nurigowod.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/fenasaviz.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/11194941833.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/47306449018.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/59862611015.pdfIn PDF document text
    • https://kaparatt.com/images/File/tedijati.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/31807490956.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/44799662565.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/40927008913.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/polemexejigizag.pdfIn PDF document text
    • https://gogift-it.com/userfiles/files/48942356758.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161308a8f7d563---pamapiz.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/ralugibawadopibapapenan.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/negoxul.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/wawiduvoguxekivuduk.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/nazozu.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/dugibexetusaperet.pdfIn PDF document text
    • http://altinay-law.com/images/file/donojoxateniful.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/25061779204.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/tufodenuwojebuxed.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/70973492687.pdfIn PDF document text
    • https://ocw.tw/uploads/files/jegiwivipewoketufaxaxem.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/61669239645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=paid+android+apps+free+downloadPDF 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_off0000db26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 18776 bytes
SHA-256: c31e1422cfa141d58c4c8ff9b5f88b7ee29819e373c04dc22ffa213000b4a376
font_01_sfnt_off00010bc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DC 10480 bytes
SHA-256: f35f7c5b92b1c9bcec72186644e1fcda92f53d001becd38fa72e2cc1edee5ae2