Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0db913eb252042…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 14:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b8e166c075d303707117a608851aa97 SHA-1: 36836dfacf39d3ca6faad3e7563c52520ee865ef SHA-256: cc0db913eb252042e08956e5c7b55652f5f2a3762f8072b402aa754a68bdc691
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with many pointing to domains that appear to be part of a link farm, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://4cmedica.com/ficheiros_upload/file/27530854101.pdf
    • https://blogsma.com/files/sozirudubizisasazevamup.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/52507630196.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/755045ebc7f7486d40f2a693ce36e27d/84404961221.pdf
    • http://busankid.com/webfiles/board/file///vitituxenuvabededekudu.pdf
    • https://pioneerlift.com/upfiles/editor/files/15802217201.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/4a7a1aa5e9eddb9693b0d5ec2d5f5a56/mutepo.pdf
    • https://debcopharma.com/userfiles/file/4224680737.pdf
    • http://wsm.hk/images/uploadfiles/file/44773640389.pdf
    • http://gaineyranchaz.com/userimages/xudilugav.pdf
    • https://medsplus.us/admin/images/file/63168997255.pdf
    • http://kwiatmetal.pl/userfiles/file/badozudi.pdf
    • http://gruaszarate.com/ckfinder/userfiles/files/lububusabevirofikopelab.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/xolelojejuxuwasew.pdf
    • https://laser123.com/geektic/files/16039339596.pdf
    • http://ctcinsulator.com/uploads/file/99183116334.pdf
    • https://kochitaxirental.com/ckfinder/userfiles/files/talapotevaxenowawepapa.pdf
    • http://barudan.hk/UploadFile/file/20210913171359145.pdf
    • https://photojet.net/userfiles/file/55281052461.pdf
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/68478008427.pdf
    • https://woft-dining.com/webroot/editor-uploads/files/21389978538.pdf
    • http://cpviettin.com/upload/files/mosarunidirofisipepo.pdf
    • http://rockefellersgold.hu/editor_up/70560490493.pdf
    • http://escuelasfutbol8.com/docs/files/witogila.pdf
    • https://tvsporedi.si/vsebina/dosezilisameve.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+how+to+get+root+access
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • 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_off0000dc51.bin
353dc8ccccaf35c3f72ca3313f51b3ba215e3e4c17a9673426f07548130415a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC51 18048 bytes
font_01_sfnt_off00010b2c.bin
e6792c9228dab0d802bb3fb20e4fa63bfcf78d5225f6eb587f01d28b403491c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 10672 bytes
font_02_sfnt_off0001237a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1237A 16792 bytes

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