Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc13a7e9556815ce…

MALICIOUS

PDF

91.5 KB Created: 2021-09-10 13:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71c85b2797a23ff086983dcb9acd1f25 SHA-1: 1a4ed45cdf915bf0aa51431e7336ecfa4761f3eb SHA-256: cc13a7e9556815ce663b1142883216ad38d22a4acfa66d86fb4fd067ee0b2683
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on disposable domains, suggesting a phishing or redirection scheme. The embedded URLs, while numerous, point to a pattern of distributing malicious content through numerous small, potentially compromised or newly registered domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://e-sportis.com/images/upload/gofawufimuzularameli.pdf In PDF document text
    • http://evevoyance.fr/adh/.-/file/duvabikalurive.pdfIn PDF document text
    • http://dentherapia.hu/files/file/nutoxivorodut.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/jawimegitil.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/68570540544.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/65679229892.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7edc64a86770ec0db889360e514fe1d/pofuzomananekuwubopebideb.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/25212306672.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/buperibawoxiputi.pdfIn PDF document text
    • https://viceda.com/userfiles/file/52217970580.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/puzoximanibivij.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/gubeperubolunab.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/sikugonevik.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/35807373906.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/85495657993.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/tizekonolenotefanimimidi.pdfIn PDF document text
    • http://all4pets.cz/ckfinder/userfiles/files/83005494360.pdfIn PDF document text
    • https://terracell.pt/images/file/pufosugalibunovefokolud.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/38325502259.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/99126109372.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613028a44d973---megusojinede.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/bavekamimubokebevoju.pdfIn PDF document text
    • http://chicopharm.com/upload/files/newepivaxamatodotoguzof.pdfIn PDF document text
    • http://schokofontaenen.de/idata/80856189251.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/tixaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=400+albert+einstein+quotes+pdfPDF 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_off0001001f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001F 18108 bytes
SHA-256: 99a1a27de3ee4d39cae117c940b5097c51fff147f4d8e5225f598799eb5f2508
font_01_sfnt_off00012ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBB 10980 bytes
SHA-256: 87c640d942153d76ab081e083b66a5169633acb090e108ffce17f6781083a255
font_02_sfnt_off000147e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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