Malicious PDF — malware analysis report

Static analysis result for SHA-256 995cbe408083d150…

MALICIOUS

PDF

75.7 KB Created: 2021-03-24 11:29:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff4516c4cf4ccd6c932f9cdb6f7dfb83 SHA-1: 235e01ac88792eb1315d653a79d8ae94b63b087a SHA-256: 995cbe408083d150c2f80b1d643da1d6ca0239ce1862d2aa13ecc27bcf72ee21
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 manipulate search engine results or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious content, specifically a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm are indicative of a malicious document designed to lead users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/wix?keyword=dnd5e+revenant+blade+feat
    • http://milatepe.medianewsonline.com/vagoguritakena.pdf
    • https://winapusumebut.weebly.com/uploads/1/3/4/6/134695108/0392ce8bebdc.pdf
    • https://pusobufuronuwu.weebly.com/uploads/1/3/4/4/134475569/wesil.pdf
    • http://gewututikame.getenjoyment.net/clasificacion_de_numeros_reales_cuadro_sinoptico.pdf
    • http://bowojimiwa.22web.org/kuriwomupilotezupofin.pdf
    • https://mifanupomiseri.weebly.com/uploads/1/3/2/6/132681757/sitilira_naleresotimaxin_lidapodatam_xeduvedi.pdf
    • http://xafegadixugu.iblogger.org/18806943852.pdf
    • https://gemujofu.weebly.com/uploads/1/3/4/3/134372819/zigovumapiripu_borawijevikon_wimari_solatasakuvo.pdf
    • http://rumafelaneli.mygamesonline.org/nopunokemumupelokogudo.pdf
    • http://xakaderinetatu.mygamesonline.org/gijowoxuxasuxuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://315736c7-1030-4200-8d24-05c9f4951019.filesusr.com/ugd/d19ca0_684b89ab4ad94e38ab3d43089b6852aa.pdf?index=true
    • https://b24182fa-1fee-416c-9f57-41d8a36573e1.filesusr.com/ugd/1cc367_865f26091a9e46e28dd98fb7266675d9.pdf?index=true
    • http://vabuperupijod.epizy.com/ncaa_basketball_picks_bleacher_report.pdf
    • http://dijijesuwaxon.epizy.com/apa_mla_guidelines.pdf
    • http://nupikokaguzixag.rf.gd/how_to_use_resistance_tube_for_exercise.pdf
    • http://wowutuzineko.myartsonline.com/biosurfactants_production_properties_applications.pdf
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_d899e9a97f1f44649ed3943bfa36545c.pdf?index=true
    • http://ziwemasux.myartsonline.com/13960007068.pdf
    • http://gebutetivifupa.epizy.com/realidades_1_capitulo_2a-_6_answers.pdf
    • http://bonubenevutura.epizy.com/magakegopi.pdf
    • http://lakekawe.rf.gd/canteen_time_video_song.pdf
    • http://veluvuwipigunuw.rf.gd/the_girl_with_the_dragon_tattoo_book_report.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_off0000eb52.bin
81872dd8a4aa91f805fb65fcfd7990b59fdd37760f4863ec9128c48ca08f9999		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 5048 bytes
font_01_sfnt_off0000fca0.bin
eddc59fe194960dd2edff591cc5b164bfbddca95fe8e05bac72020400e0207e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA0 10720 bytes

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