Malicious PDF — malware analysis report

Static analysis result for SHA-256 750b66a146ba947d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 19:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b782df05a760f0099690177a82d7a91d SHA-1: 9cf73dcb2b66af224b00aafa77f3b690b36c43fa SHA-256: 750b66a146ba947d531c62c8c8a10b78c43c2eb009c7483191f54470d2e54a16
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as phishing-related. It contains numerous external URIs pointing to various PDF files hosted on disposable domains, indicating a link farm designed to redirect users. The presence of embedded URLs and the heuristic identifying it as a link farm strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pixomot.ru/uplcv?utm_term=add+bookmark+chrome+mobile PDF link annotation
    • http://jumpinfit.it/userfiles/files/83261465999.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/68980544218.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/61340cfea30a9.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/13357714190.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/zafodo.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/8644310561.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/faniwumabuba.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/wigene.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/89583585961.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/22785817146.pdfIn PDF document text
    • http://hingliltd.com/userfiles/xonadatavuniguwi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b53c74c825---82160337350.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/88bc06133f940e851e2ef16b0203d06b/dalinadazuzu.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/4050621520.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/zikenikevabejulov.pdfIn PDF document text
    • https://panama4d.com/contents/files/tefuji.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/gokope.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/16973111626.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/vokukonoripovikefi.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/80097712711.pdfIn PDF document text
    • https://almavilag.hu/files/files/71603635528.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/11301152870.pdfIn PDF document text
    • http://airsoft1.ro/files/file/xaxurawokixobamumonodep.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/52088040271.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/xiputebejofi.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/fimulazejoxolitip.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_off0000d597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 18100 bytes
SHA-256: 6918208af786c9e33106c23057cede8d45e479e5909ab906d9344218946fba2a
font_02_sfnt_off00011c01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C01 10476 bytes
SHA-256: a7c477bbf230fd4957febc478eb27c5b4ba8d5dc65e766f28d4d5727edcaa387