Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf10941c1e6f6d7…

MALICIOUS

PDF

96.0 KB Created: 2021-09-13 12:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b259d7144dbc9149dae6773e5e3ecb83 SHA-1: eaf43cc5ad1fd54f0deee103ab6f42f983cb752a SHA-256: caf10941c1e6f6d787001c930c34f87c0b853b326307f2065c45cb8640e9158a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, a common tactic for phishing and malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating an attempt to obscure the true destination. While no scripts were extracted, the presence of multiple unknown URLs suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5103

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 http://xn--4k0b43gkwo4gn.com/upload/editor/file/98744208764.pdf In PDF document text
    • http://greenmodels.ru/uploads/files/45965456469.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/denidaxidavasa.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/45869891595.pdfIn PDF document text
    • http://exosushi.com/uploads/files/21306342358.pdfIn PDF document text
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/wuzefifujib.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/35526734448.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/zasadanatokudoxub.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/52358402488.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6e4311f4e---89403317128.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/64446234760.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/juvopijeronupugera.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/62688835095.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/30282680185.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210913023113.pdfIn PDF document text
    • http://greenbrier101.com/userimages/fozubipuxipojiguset.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/titozatazedig.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/takit.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/nerosatozetadolakababizox.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/bitotikusomelitanotegerag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=en+iyi+android+pil+tasarrufu+program%C4%B1PDF link annotation
    • 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_off000130f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F1 19040 bytes
SHA-256: 533aeb631ebeb88eb30d14336444baf90beaa97377b5983bc4e6cbd87e22157b
font_01_sfnt_off00015fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15FA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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