Malicious PDF — malware analysis report

Static analysis result for SHA-256 447f5351c6ad1e09…

MALICIOUS

PDF

67.6 KB Created: 2021-09-19 08:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc7d23b46743e44241ebe3ca3a536b72 SHA-1: 9e45cbb819739af9a8e6e5d8660fdcb7dad9be41 SHA-256: 447f5351c6ad1e0947d13ef279a99881699c2992edb154f377f82c46f9a8bcca
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this purpose. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or SEO-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8854

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://physocare.com/Images_upload/files/36119940442.pdf
    • http://jandebruijn.com/uploadimages/files/kinezajunobidoju.pdf
    • http://skpizzasubs.com/uploads/files/bikojakujarazisumoxiza.pdf
    • https://toyotaautobody.com/ckfinder/userfiles/files/62236214549.pdf
    • http://dailitara.lt/bites/uploads/file/xolizide.pdf
    • http://stihoplet.by/upload/editor/files/76144170569.pdf
    • https://khogiaydantuonghanquoc.com/images/news/file/maneloboxasibepaloxoj.pdf
    • http://www.cbs-emballages.com/upload/file/83965859753.pdf
    • http://www.parinet.fi/tiedostot/files/gelosifelufewurepipovo.pdf
    • http://9y.bfage.com/upload/files/20210907101655.pdf
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/juxebo.pdf
    • http://khyljg.com/uploadfiles/files/nepaf.pdf
    • http://olgapolyakova.de/files/files/nojelikelirimoxudasuwafar.pdf
    • http://bighost.vn/uploads/userfiles/file/78485814140.pdf
    • http://studioaeditecne.it/userfiles/file/42448258757.pdf
    • http://modero.vn/upload/files/pasubejirat.pdf
    • http://teplorium.su/userfiles/file/mivaxeritaven.pdf
    • https://bednidhitraders.com/userfiles/file/dazokero.pdf
    • https://ladangmimpi2.com/contents/files/21154369780.pdf
    • http://rts-3.ru/upload/files/97336270519.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/9d561e1ccd58cc1aa6734dd1adb863b0/medogov.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3019cb3f8---23982429583.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=death+becomes+her+streaming+free
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc69.bin
76dbfa2693a0e8241339e70d1e1accedb10a4dd15da9e51cd13fb1074928b241
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC69 10876 bytes
font_01_sfnt_off0000d55d.bin
051ce5632d477dc6c1fa6b38df3c1e671eda9a380700800e8561045519ac387c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD55D 16964 bytes