Malicious PDF — malware analysis report

Static analysis result for SHA-256 a336c29877e7a08b…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 00:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4337652556aae5558c960df73fe843d1 SHA-1: 72a74df5bf89a3f783fe7de90dcdaf5c9a6ca886 SHA-256: a336c29877e7a08b829d134e7e0f07ccad7952c0538d9745e773867f802448a5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to redirect users to malicious sites.

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://cartopack.com/Images/file/70513784591.pdf
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/95603494906.pdf
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/sujugifevovaze.pdf
    • http://sententtech.com/file_media/file_image/file/36588557017.pdf
    • http://salocchi.it/userfiles/files/biraxalufi.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef51b0485e---sanemelazowomofu.pdf
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/dunuzup.pdf
    • http://luluscafeonline.com/uploads/files/53512923693.pdf
    • https://pixel.bg/img/file/finusakazazogibid.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/74851484298.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/17407530227.pdf
    • https://matraci.info/UserFiles/File/63360351366.pdf
    • http://xedaphcm.com/luutru/files/39513365383.pdf
    • https://movie2book.com/userfiles/file/tomonobax.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16135d69bd5d4a---pudoz.pdf
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48861928856.pdf
    • http://twtime.com/uploads/files/202109170000531498.pdf
    • https://doctmcooper.com/userfiles/files/45141219577.pdf
    • http://alessandrobelleseveterinario.eu/userfiles/files/49165741754.pdf
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/duvofalixenajolewokojitap.pdf
    • http://gesht.ru/admin/ckfinder/userfiles/files/7392010126.pdf
    • http://techsystem.gr/data/uploads/ckeditor/files/medivenojebeviluzuwurele.pdf
    • https://jairdefreitas.com/ckfinder/userfiles/files/36963521058.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=watch+rupaul%27s+drag+race+uk+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A2 16792 bytes
font_01_sfnt_off0000c9b9.bin
7661f2c99214a9d679a516800e9efad21b4b7264c63df882c375724ee4d2f116		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B9 11116 bytes
font_02_sfnt_off0000e37b.bin
417da04fea4bc4b25ae7d6be2fd8ebf28332f917a27edf0010200ff98d1c846c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE37B 15600 bytes

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