Malicious PDF — malware analysis report

Static analysis result for SHA-256 915b0336a26fcdcf…

MALICIOUS

PDF

67.7 KB Created: 2021-04-08 08:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ded5c68fb46d2be0b2808b539ac65af SHA-1: dce1960d190084c29ea1d518b14ead6ce237a4fb SHA-256: 915b0336a26fcdcf49d0e3e9dc853bbc8aa33af56b3dc6cb63d02fbf6f2cca36
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=true+freezer+manual+t-49f
    • http://eushopvmn.site/ted_ed_where_do_math_symbols_come_from22tcb.pdf
    • http://jadogaxarabu.mygamesonline.org/jevegip.pdf
    • http://cashthe.ru/75632221836q1bq4.pdf
    • http://helplnstagramcontact5087423.com/sozavutuguzagunilurimibogpj2p3.pdf
    • https://tuxewuwa.weebly.com/uploads/1/3/4/7/134776055/nubasonisopexe.pdf
    • http://instapodarok365.site/estudio_de_factibilidad_de_un_proyecto_de_construccin_excel5ivo6.pdf
    • https://nevajuto.weebly.com/uploads/1/3/2/6/132695651/fomovil-bububurev-xarubetozini.pdf
    • http://pisufixefonof.scienceontheweb.net/breast_cancer_project.pdf
    • https://musisemikalig.weebly.com/uploads/1/3/4/6/134694348/kixidukofubijolo.pdf
    • https://puwikemumej.weebly.com/uploads/1/3/1/4/131454306/lugekinuviwaj.pdf
    • https://pigaxapi.weebly.com/uploads/1/3/2/8/132815084/6037676.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1c78353c-3b4d-45bd-9fee-f9f85d69ca54/80172895689.pdf
    • https://uploads.strikinglycdn.com/files/9e6618c4-8980-4f47-891e-dc1684ba1aea/fetowuboma.pdf
    • http://magegefopo.atwebpages.com/ziredafidilizorubagolage.pdf
    • https://uploads.strikinglycdn.com/files/26d13bca-9477-40ca-a8ca-b003d3a6085a/moto_g6_release_date.pdf
    • https://uploads.strikinglycdn.com/files/af066830-13cb-497a-97d7-cdde64eb8fca/golds_gym_treadmill_maintenance.pdf
    • https://uploads.strikinglycdn.com/files/73238825-07b0-4afc-94b0-b051f5d3d887/doturoronuxiwat.pdf
    • https://uploads.strikinglycdn.com/files/9a955d0f-f2e1-4c77-8d14-3fc38de3d59b/used_bose_lifestyle_48_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/95b130cc-e3a5-4082-be8f-a52d08f42bab/verizon_lg_flip_phone_user_manual.pdf
    • https://uploads.strikinglycdn.com/files/613afdcd-0af4-40e8-8340-079ee6d3e3b2/49292030086.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cebd.bin
eb9bbb6985710de4d1d814e2291345305335d6f6ca06209480e9072e7d1378fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBD 5008 bytes
font_01_sfnt_off0000dfc1.bin
73111b6f42f5824c72feb72208b9b6d44a6e8aa152e1536bf82619a4eab68c54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 10100 bytes

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