Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad23177b6cac9263…

MALICIOUS

PDF

75.6 KB Created: 2021-09-13 11:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 09aac8db47586da2a57f5976c92bdace SHA-1: 0e7120042371a3d265ec348aae5ff38e53674a45 SHA-256: ad23177b6cac9263dd4844ee12240e365fe4363761e82daa63782fc69ed5a723
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external files, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing lure, likely attempting to trick users into downloading further malicious content.

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://golfvillageonline.com/userfiles/file/22203043734.pdf In PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/38996892421.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2109061551248322308x2ri5.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/77668636892.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/22044259316.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/71495373974.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/suxomezepoperaxujip.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/baluduvosabatudukegad.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/vominoledoxaligezewatumiz.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/20904742090.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/texare.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/42570450184.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/zilonedururiludepofenuden.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/zegunedi.pdfIn PDF document text
    • http://asustainable.com/global/file/gupudojokedomov.pdfIn PDF document text
    • https://coluer.ir/documents/file/masuginu.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/piperasusavamixid.pdfIn PDF document text
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/dubijeliwanerefivimekuwu.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/sarogebowapijut.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/54041319784.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/87184325990.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb10f3ea1---13874136029.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/dubejariz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=update+software+samsung+galaxy+s3PDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/taponajorove.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_off0000c34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34C 16668 bytes
SHA-256: d090b4be82b990eca4d6dc5f9b1b07a68f355a38072545aebe781d8881fdb808
font_01_sfnt_off0000ee47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001065e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 11328 bytes
SHA-256: 18368c7613911fdb222f9187b577ee41f327e4369116c79c53e8f1c0eed3bf58