Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0969c371b8e374d…

MALICIOUS

PDF

66.4 KB Created: 2021-10-01 03:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4077633aefcb5f4c5397b309de85cd33 SHA-1: 1d6ae47d763b26c543cdbee02a7558a5f97028bd SHA-256: a0969c371b8e374d01823d83c9bf979ee31d33b74d008abcc5f9659c3828aa4e
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it's a link farm on disposable hosting, with numerous embedded URLs pointing to PDF files on various domains. The primary attack pattern involves directing users to these external PDF resources, which likely serve as phishing lures or malware droppers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5022

Heuristics 4

  • 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
  • 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 https://westhygiene.hu/editor_up/885172221.pdf In PDF document text
    • http://aihyang.com/userfiles/file/tutekinepalofupikeva.pdfIn PDF document text
    • http://3asoft.vn/img/files/sodel.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/fufarupebober.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/dibudumojixutakew.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/18293541470.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/89753589982.pdfIn PDF document text
    • http://ausafe.net/images/art/files/dumipolelinamanivawes.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/bazitabulufagujovefejis.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/55786335201.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/17122615685.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/balizonilivopux.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/98039647788.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a330c1e024---robemuwe.pdfIn PDF document text
    • https://digireg.cn/upload/seduximeta.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/wofuvutaludifigon.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/boxufovozavimave.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/86796695340.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/zenif.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/razirafor.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/57826770020.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/dolunisi.pdfIn PDF document text
    • http://ijfbn.com/editor_up/zejasuvapakuxofogimujope.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/lerofimalimenu.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/tabeno.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/jojarotuzedewavexux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=russell+unpopular+essays+pdfPDF link annotation
    • 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_off0000b1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B7 10560 bytes
SHA-256: 7b72cf8cb6452d57d4df0d2cd85591982a3c091b039f94be49cb0843c37b359e
font_01_sfnt_off0000c9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 16284 bytes
SHA-256: 29bbc03004e55270abd44eb1214d9017c9055bcf4afec8c4b4d4c45087a315db

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