Malicious PDF — malware analysis report

Static analysis result for SHA-256 763446f4fcb155b8…

MALICIOUS

PDF

93.7 KB Created: 2021-09-11 14:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2bd58a4fd75cc71fd0657b78c9237db SHA-1: 7cc438db9da6d09a0e560a35a3ff446b6cc3c270 SHA-256: 763446f4fcb155b882b9b915ea010de976b340fcabe7f02b5e73a31eabfb8eb0
94 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV, specifically as a phishing trojan. Static analysis revealed it contains a large number of external URIs, many pointing to disposable domains, characteristic of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.2254

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://novinfasteners.com/userfiles/file/rutize.pdf In PDF document text
    • http://ulv-fogger.es/d/files/22048976093.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/36db1b35f326fcf09064cc504d5ccd5f/18362776207.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/pufotemuzofikaporodusam.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/541787453.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/20504146025.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/45458073291.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/62174665600.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/6741067335.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/61702013918.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210907154250.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/sifunosekomamasazujaze.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/panetizewugatep.pdfIn PDF document text
    • https://krossi.ru/images/content/files/55270599012.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210901145036.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/nusokojoxovosilitek.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/14061291443.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/33072184819.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312f4fe4a10---nidukogagojifakunowewe.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/73156117391.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/13597194091.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/76127171819.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/31972100298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=open+emu+androidPDF 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_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B42 10364 bytes
SHA-256: 317f6d7768e3e5a61ee0799d408de3f8b12428f79ba12fb62a7e3a485be1903a
font_02_sfnt_off0001428f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428F 21912 bytes
SHA-256: c655df703d7876841020da220e19780326f4d6b448a8da06ede4ef11ed022eb4

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