Malicious PDF — malware analysis report

Static analysis result for SHA-256 49af9cf41693293b…

MALICIOUS

PDF

92.8 KB Created: 2021-03-20 19:57:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 865096c21b0d0846fb4cd5b2c2279586 SHA-1: 1ca7338e41079343c46cbcfbefb3f94a935798bc SHA-256: 49af9cf41693293be05ec4471f26656b2742120a4ec8fe779aaca003b9c6afa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The ClamAV detection and ML classifier strongly indicate malicious content, likely phishing or a trojan. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/strik?utm_term=dwarf+fortress+wiki+stone
    • https://cdn.sqhk.co/koditisalupe/hhdhiIW/pixel_pinball_arcade_game.pdf
    • https://palepolute.weebly.com/uploads/1/3/5/9/135963306/8452243.pdf
    • https://cdn.sqhk.co/zomuzesirira/j9R2HIL/42200240276.pdf
    • https://gakefutafo.weebly.com/uploads/1/3/0/7/130739004/5926675.pdf
    • https://cdn.sqhk.co/bukoxomule/FyJjg3u/guilty_gear_isuka.pdf
    • https://vimixake.weebly.com/uploads/1/3/1/1/131164471/3198099.pdf
    • https://gifetapajuloper.weebly.com/uploads/1/3/4/6/134682222/b374be6ea01f1.pdf
    • http://wogivodugakovek.mygamesonline.org/motorola_mc55_scanner_software.pdf
    • https://cdn-cms.f-static.net/uploads/4465685/normal_603a783992731.pdf
    • https://cdn-cms.f-static.net/uploads/4506063/normal_6023f198c65c1.pdf
    • https://juxipibofo.weebly.com/uploads/1/3/5/9/135985723/ruxawamovum.pdf
    • https://totujefova.weebly.com/uploads/1/3/4/0/134096099/jomumiren_fexuwazira_sonasezosemib_kogagodi.pdf
    • https://dexekuweda.weebly.com/uploads/1/3/4/7/134705305/81e0314f4ee2c.pdf
    • https://cdn.sqhk.co/jujifefa/d21hdgf/fokiwedufapugi.pdf
    • https://static.s123-cdn-static.com/uploads/4481662/normal_5fe496e9160c0.pdf
    • https://wogalipa.weebly.com/uploads/1/3/4/3/134316604/2509033.pdf
    • http://jedusajinud.mygamesonline.org/alopias_pelagicus.pdf
    • https://wirafoxojobukof.weebly.com/uploads/1/3/4/6/134608935/luvekuxozidegesexaso.pdf
    • https://cdn.sqhk.co/pibepufas/ZzhjjcV/tenulotukodofase.pdf
    • https://ninuxegomozul.weebly.com/uploads/1/3/1/8/131871835/d63d847.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fc59aa2a-5888-4702-b443-e06658b9ba2c/lista_de_verbos_irregulares_en_italiano_conjugados.pdf
    • https://uploads.strikinglycdn.com/files/deef3f18-525d-4d11-a3d8-3be30e58a818/how_to_care_for_nimh_rc_batteries.pdf
    • http://wegamaluperetuj.atwebpages.com/kizejufalabirofepovetiv.pdf
    • 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://scripts.sil.org/OFL
    • 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_off0001094e.bin
88c4db51171e64896fa4823ece717ccbe87012b727a910b8b840cf32c8f96cc0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 4884 bytes
font_01_sfnt_off00011a18.bin
ed424b14dc419f30992d3e92a406a09201b9ad5d327ebe26504f7f196910d0d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A18 17024 bytes
font_02_sfnt_off00014ea4.bin
0845746d8e0f76c2c57e53a5d0c2d2ba36ed31c4724e2802406f297ba1795667
pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA4 16132 bytes