Malicious PDF — malware analysis report

Static analysis result for SHA-256 b648fe5ead9160dd…

MALICIOUS

PDF

72.9 KB Created: 2021-09-18 02:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 76891220248b07b991fdb0a4500aefc5 SHA-1: 1c61109c1e727a3e47540328039e9741780e328e SHA-256: b648fe5ead9160ddf08a5608a5ba7d713c15df7d8ae241b2129bd245db0d0db7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious content, likely involving a phishing pretext or a download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pistant.ru/uplcv?utm_term=best+movie+apks PDF link annotation
    • https://33mobility.net/uploads/files/72539416402.pdfIn PDF document text
    • https://alummaswaja.com/yii/sdbalikpapan/home/images/upload/files/63258709696.pdfIn PDF document text
    • http://atek-ent.com/upload/file/98072282210.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/28107869824.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/35066860304.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/48176500592.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/gigijoforamitapav.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/fadatigusokisedofexuwoval.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/69237984122.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/kesabubalekijifigixa.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/popokigidulu.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/28796727482.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c6697c1211f58cdcc2ae1b7eb21fd728/127456805.pdfIn PDF document text
    • https://clove7.com/userfiles/file/rizubotero.pdfIn PDF document text
    • http://nincity.de/inline/file/gexowuzoluluti.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/veziwiwibekovafa.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/20504394179.pdfPDF link annotation
    • https://rippa.pt/files/file/10948662521.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/kivemakura.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/71320003977.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/34afd451957ef9438b339eaf0e1783c4/sekug.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/66723789451.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/zupebikoselegapidor.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/20415123859.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_off0000b9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C9 10372 bytes
SHA-256: 4926c0acab4789fc05870dcd4e8c2125efa177b0ddbd0abc528c159b8be99142
font_02_sfnt_off0000e964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE964 17616 bytes
SHA-256: bec2596dfe3bc06c93cf6dcd20c1fd2f1951c3b5aa17f32affe948495da8363f