Malicious PDF — malware analysis report

Static analysis result for SHA-256 981cd254e8bb091f…

MALICIOUS

PDF

76.9 KB Created: 2021-09-17 14:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 852ae4c0618b5b4b941a4346f46373c3 SHA-1: b9031f5cd9d5a05b2bbd73f13c97b7a71f1b6762 SHA-256: 981cd254e8bb091fb24d0b03430d1f0e64e21c2c4d96a40b49ef72fd8f274612
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting it functions as a lure or redirector. The PDF structure and embedded content are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8397

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=car+stream+apk+without+root
    • http://ztkammer.at/uploads/file/subomixekulu.pdf
    • https://venusnvs.com/userfiles/file/23420807568.pdf
    • https://megacook.pt/site/upload/file/76843024893.pdf
    • http://www.moyekolodin.com/files/78325278707.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/9a224c571b3fcb96f961e9a1b75f38a5/tonibuzekigatemuk.pdf
    • http://chothuexeninhbinh.net/data/dulieu/files/pibumatulusubibusiwi.pdf
    • http://rotarybrescello.it/userfiles/files/maxovizoxokami.pdf
    • http://techniq.ae/admin/uploadfiles/file/nobugivagukuravugexipule.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/lirazidejurusalijezi.pdf
    • https://condicionamentofisico.com/arquivos/file/zutifovure.pdf
    • http://ucokampen.com/media/files/78881382097.pdf
    • http://riccaassociati.eu/userfiles/files/4529002952.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137f190ae5a4---linukolofujefi.pdf
    • https://fwstc.in/userfiles/file/80407721339.pdf
    • http://maskaevlawyer.ru/userfiles/file/601194651.pdf
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/32764357151.pdf
    • http://encino.kopanramen.com/uploads/files/nexajunisolituralugetogu.pdf
    • http://bhk-aindling.de/userfiles/files/88569299714.pdf
    • https://k-newsletter.com/ckupload/files/zovewenorega.pdf
    • https://edubox.mn/uploads/users/0/files/xodalugid.pdf
    • https://houstoncoinshow.org/FCKeditor/file/niluruvaperu.pdf
    • https://siltri.com/fck_upload/file/13640298348.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcd1.bin
b69e17fb370391d1954fe2e37ccbb735536ab8f2d41d9cf12fd56dc5b0ef45fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD1 10676 bytes
font_01_sfnt_off0000f56b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 16792 bytes
font_02_sfnt_off00010d7d.bin
e63b89f731a66023480e17d6924d3ab97d2cb96117271035a13c1b83fe23b8a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7D 17416 bytes