Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc0a2bae3bc7b2b…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 22:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93c1ead0d3e6ff57f649a4b01024b126 SHA-1: 8c922d72258f97dc48756dce64d4005e49eea316 SHA-256: bbc0a2bae3bc7b2bb4287bb83f3f6ad8a9eca9d5aa48238199270ac2885d84a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination or host a large number of links. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://keralastatetailorsassociation.com/userfiles/file/zuzerosol.pdf
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/woliwelazijumopami.pdf
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/54588168098.pdf
    • http://agrion.org/upload/fichier/95038819433.pdf
    • http://newkontakt.ru/userfiles/images/file/83251721233.pdf
    • http://vncdata.net/app/webroot/uploads/files/98656087508.pdf
    • http://cee1968.com/ckfinder/userfiles/files/47793273827.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/fa15cc54a2ede9ed07acc1626e293eba/salujagijiposaf.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/pofogej.pdf
    • http://riggi.ru/userfiles/file/27335788619.pdf
    • http://protezas.lt/i/File/3787868015.pdf
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/34046233015.pdf
    • http://thekreativecompany.com/uploaded_files/userfiles/files/68499633069.pdf
    • http://guerrazzi.info/userfiles/files/1898460176.pdf
    • https://jpt.mysmartedu.com/uploadimages/files/56967991016.pdf
    • https://icbacademy.com/upload/files/kasotuxinulitidenosigu.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437b46461e2---lawibuxifozijuzovigiz.pdf
    • https://barcelonamedicalcenter.com/files/galeria/files/pisipajiwakawuwevolebe.pdf
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43148319136.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=patient+in+affliction+faithful+in+prayer
    • 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_off0000c953.bin
75f3589f6c5b991f4ac396a9b9f5d61bc3badd698cb0505a7ffd9609fe61cadb
pdf-font-stream PDF embedded font (sfnt) at offset 0xC953 10624 bytes
font_01_sfnt_off0000e191.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 16792 bytes
font_02_sfnt_off0000f9a3.bin
cb8687edd4cab3be40c9f1abef3de61d9f23d6e1b88b42633745cabc0d1de081
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A3 20488 bytes