Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31afbfd9ec84605…

MALICIOUS

PDF

70.1 KB Created: 2021-09-26 09:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 517245b6b611dde6d39f52d80efd81e4 SHA-1: 4d08bdc3f292beeb376596d684ccd5a5424bb578 SHA-256: e31afbfd9ec84605ffabf9e9798741407103908a0b4644e1387a085b34a4bb8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://abbeloosschinkels.be/userfiles/file/gubabeniduxolotevugisi.pdf In PDF document text
    • http://k-souz.com/userfiles/file/76346859848.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/bafimodabawunuduli.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/62324269609.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jopojawikuvajodimujunas.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210912_141534.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/jusizajezipukujawomoza.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/borigujikuna.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210907193558.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/53466745652.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314376ab525---guxodap.pdfIn PDF document text
    • http://esistore.com/userfiles/file/54122289782.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/dabivawegalazonadux.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/87375809512.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/kaputorufukunu.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec1bcb8930---14537920733.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/bonudepuditimapuli.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/40714702422.pdfIn PDF document text
    • https://ubranni.com/uploader/files/mozeleguzutilawexevogukib.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/vogekugaj.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/febewewatikuxexanafavele.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/raxetugibibutabined.pdfIn PDF document text
    • http://carszana.com/image/upload/File/37733998636.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/sotupavedumel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+set+apple+music+as+ringtone+on+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_off0000b280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB280 11032 bytes
SHA-256: 7d44fd467619bf8ced702d0facdc2d64abf03d05979a369feaf0f80345041226
font_01_sfnt_off0000cbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 14476 bytes
SHA-256: 44a28bd18679d32902244d8385675a3add20caf9f83810480ae63ef9678505f7
font_02_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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