Malicious PDF — malware analysis report

Static analysis result for SHA-256 dada3959e66b32b6…

MALICIOUS

PDF

76.2 KB Created: 2021-09-27 07:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d5697d037605e0d648496c0c94be3685 SHA-1: 7d8d371e393c72d36bb81a695bfb2b762e5bad18 SHA-256: dada3959e66b32b67c13351ede6195ad56a8a2cd00687eb123ffed9abe053fbd
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to other PDF files hosted on disposable domains, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://palletgoanloi.com/img-dn/files/jidajaxopamitoviv.pdf In PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/86895850772.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/pefabonibafubisanej.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/22900370035.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/nubabozig.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16143afd706687---varagu.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/xanuneletukikub.pdfIn PDF document text
    • https://equalland.com/uploads/File/pakesoturitileporupi.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/87720022218.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/43532796628.pdfIn PDF document text
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/zadojavakipatujogazupa.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/36780887528.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/29461341119.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/82661744344.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/gogusezapavilunosijowi.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/gumemeve.pdfIn PDF document text
    • http://splogservice.ru/content/file/33585943040.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/82644353920.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/wudiv.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/murawokezupu.pdfIn PDF document text
    • http://prosquash.by/data/84569990832.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/jiwanegusaxozoj.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/91685762881.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/34476581488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=basara+ps2+androidPDF 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_off0000bab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 21684 bytes
SHA-256: 4b05885566b47e86a2078153f9982fff11dec4dcd178584fdce66bfdf7879ec2
font_02_sfnt_off00010c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3A 10284 bytes
SHA-256: 081799d719ed7086e20e5512afc07547afec17d0afdf562e99cdbc62886eec95