Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cd2f0e19e2eaa2…

MALICIOUS

PDF

72.3 KB Created: 2021-10-16 07:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: c8229f0759d6056d59eb2776f1dc3e84 SHA-1: 76b8c3890f38f30eaa9ab4f9ebe3e1a75f0821e5 SHA-256: 93cd2f0e19e2eaa2c1b937ab6cd70a2c3ba473c9a31aedd582f04e0526396de6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the nature of the embedded links and the detection names suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://rosg.net/sa_upload/userfiles/file/20210929061217.pdf In PDF document text
    • https://totszerdahelyikultura.hu/images/file/kulamivibope.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/22401197888.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/32750200324.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/remesasapumufuwivejuro.pdfIn PDF document text
    • https://expomediainc.com/upload/file/viwuxedekanozapuda.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/20605982872.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a386soarjoorunkngp0s85gq37/jopuj.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/domagedevopukegalu.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/pibomul.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/55712911948.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/zobibomixavitalujelom.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/21744681600.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/dafatuxizadudajobemi.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/wifelomuwi.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/zuwejaxofulabilo.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/bipovenova.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/viguwapimumenivujorixaxod.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021101605304573499.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/bozuzebikedet.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/6654940578.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6qgt139aaqj16k0o99hvhd1mt2/15049454768.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/696021834.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/dinivano.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/10613697381.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/EqozwcbAC44/uplcv?utm_term=permanent+resident+canadaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000b9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B7 10364 bytes
SHA-256: ba7c8dabc119665bcf4dc78f3e4650b7b4da02a005d6445cb6b42a693bdbad8f
font_01_sfnt_off0000d11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11A 16796 bytes
SHA-256: d57989a35436b13149bea77361931d6e9202117379e28528a9bae2609ad2640a
font_02_sfnt_off0000fc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1