Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4bcbcc08b8a632…

MALICIOUS

PDF

78.0 KB Created: 2021-10-08 18:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c3fba194115f5eb90f840d9b7fef272c SHA-1: 815ae5c4340079037747bcf2dbd93dd9fcf826ee SHA-256: 0c4bcbcc08b8a63226deca7b61accbea0791415f881c26c5afd87c15142d7887
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and ML classifiers. It contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a large number of low-quality links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5974

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://laborke.ru/uplcv?utm_term=pet+the+kitty PDF link annotation
    • http://igabana.com/upfolder/e/files/20210929050720.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/bukepunowo.pdfIn PDF document text
    • https://jotelek.hu/files/file/70539356656.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/sigegomonoxodonaxukazaba.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/mitusamimofololewotu.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/80891690371.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/tusujeme.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/xopowobafonoxusawofuwav.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/55375032348.pdfIn PDF document text
    • http://tarp.longi.tw/uploadfiles/wunumaxepalufemirazikafo.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/lanumamulap.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/94859989458.pdfIn PDF document text
    • https://pulsekb.ru/admin/ckfinder/userfiles/files/digomexi.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd29d52bf---93597800154.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/24030387787.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/85364676888.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615229af4f612---43420722439.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/rexupigava.pdfIn PDF document text
    • http://8njl.com/userfiles/files/kumizo.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sipazugunudolakos.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/51788348076.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/woguregabusut.pdfIn PDF document text
    • 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_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 9712 bytes
SHA-256: 508b797b95980c8a3dfc835d022478ead5b7690840842429e81b27aed7a6abfc
font_01_sfnt_off0000f4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 17128 bytes
SHA-256: 42eb42474c2374ef646c1fbc42243171ea57da799e21e416e496dab173b6c353

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