Malicious PDF — malware analysis report

Static analysis result for SHA-256 f640798dfc6ac5ab…

MALICIOUS

PDF

63.8 KB Created: 2021-09-14 00:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc1a0cecd2b9c121cefe766b98a2b7ca SHA-1: b4691df7449abe5815e7501b39769170a4637536 SHA-256: f640798dfc6ac5ab32fb881fb1700403cf635da49886762d51d560d1ff18929f
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a critical heuristic, indicating it's a Pdf.Phishing.Trojan. The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of external URIs and the overall structure point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

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://oniceh.ru/uplcv?utm_term=watch+demon+slayer+mugen+train+movie PDF link annotation
    • http://msdoubrava.cz/foto/images/file/58369968997.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/19730498143.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/44902870660.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/tavujeruliwolive.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/mixowepolepopafufoge.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/ragikepiludi.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/48897577230.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/vojufubin.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/jipulepawixu.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/disixazosirobaku.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613343ec1ee52---71971286907.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/09/08/bapojowaxuleriwudolutajo.pdfIn PDF document text
    • https://derfo.info/resimler/files/5544986767.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/23347434284.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/tozarimanobuvamogexi.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16313422988312.pdfIn PDF document text
    • https://uangraja.com/contents/files/59077767308.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/70743067602.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/99696025541.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e319d22dd---31130789551.pdfIn PDF document text
    • http://vigova.com/Images_upload/files/72877641334.pdfIn PDF document text
    • https://vientangluc.com/upload/files/71500276703.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/30753717688.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE376 11092 bytes
SHA-256: 0f96004a129ccf4b68cc6b40ad53f57d28837488cbf00ccc1bac5914499e573a

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