Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf8f413ec3cea83…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 20:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9cdb4c679d9f05f2735e56d4fd80313d SHA-1: 4fe18c4201cd4aa9b8aa6abe26ac5231e37806be SHA-256: abf8f413ec3cea831a9f34e5b231b14b2be9d0c2c4ce121d946fbdb63fe33fd5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs, with one heuristic specifically flagging it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an intent to redirect users to potentially malicious websites, consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://crysiq.ru/uplcv?utm_term=best+american+football+streaming+sites PDF link annotation
    • https://sitpchemcieszyn.pl/_sitpchem/file/51570518354.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/50306480862.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424ed093ec5---nukinipe.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/lafixaguxagojitos.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/perowuzizezurasazin.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/lovixitowipufi.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/mipotijaravupikox.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/baxawozubewaborij.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/11225865222.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/99368282676.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/gobukeme.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/21947004677.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/70342118272.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/sikoxigaxotimizu.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091603372973499.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/84801035222.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/82349405737.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/kesinak.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/19310278757.pdfIn PDF document text
    • http://halaljones.com/uploads/files/zolazafapenasinasex.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/87214410774.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/xaxokimarukagowi.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/punizurojuj.pdfIn PDF document text
    • https://o-dance.com/upload/files/5167390460.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/50095194611.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_off0000e0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 10872 bytes
SHA-256: c025c190339511e128ed31c585b64c2bea8908a55b4b8799134e7ed624145230
font_02_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 17644 bytes
SHA-256: 787ab9c7bdbfba280ec4f17019a4f49a92b2087521919ae0429c563cc9b008d0

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