Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81bcbd26bf00697…

MALICIOUS

PDF

78.4 KB Created: 2021-09-15 21:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90fa9eec15b81869d26a59e3c5f09cf2 SHA-1: 1bda78a391d500b1445388817f5b58b6375a7d16 SHA-256: c81bcbd26bf006975190694bbea2c82f4d1b2fc6451346bd2e4de53136fcd28c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with many pointing to unknown or potentially malicious domains, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://hennel.hu/sources/elemek/file/40060837366.pdf In PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/fizojuxigaridadew.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/digarodorisutudolin.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/xepupijilanesegupejorino.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/betagekewilopov.pdfIn PDF document text
    • http://sro52.ru/uploads/files/53861708603.pdfIn PDF document text
    • http://gibisch.biz/files/files/pikujasazari.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/wetimevumenojuminu.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/seriposut.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/xufidipegavoxegida.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/34485924468.pdfIn PDF document text
    • http://autavrabek.cz/obrazky/file/99823324272.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/96856193722.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5830ec66e---rurijevoko.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/doraferapigarebame.pdfIn PDF document text
    • http://vce34.ru/attachments/file/39824410891.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/50863269580.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/54118088964.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/76088509459.pdfIn PDF document text
    • http://baoveantam.org/upload/files/tazexixa.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/37000116445.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/rowodipupojedulamafib.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/68695188790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=getting+ripped+at+50PDF 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_off0000cf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 10528 bytes
SHA-256: bbd8f195c07ee42883ada1fb0a47e654939abbc884dd84cb2807cea283ad5665
font_01_sfnt_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 17448 bytes
SHA-256: e81a1a151832ee5ab71a060cfbcdf3daafa32149aa5583582c4ad5a00c63b70d
font_02_sfnt_off0001143f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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