Malicious PDF — malware analysis report

Static analysis result for SHA-256 877c522b6863f297…

MALICIOUS

PDF

91.7 KB Created: 2021-03-28 18:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f377184a97787f33ff10bfaed1e60067 SHA-1: 25847cadbe05d295311e9bae0c212801bcb1a6e3 SHA-256: 877c522b6863f297de84f88618b1e20664409bd1769f186db8ed9a9d5130bec6
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with several pointing to disposable hosting and one specifically related to a Naruto theme, suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, potentially leveraging PDF vulnerabilities or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://jottigo.ru/award?keyword=naruto+the+seventh+hokage+and+the+scarlet+spring+pdf PDF link annotation
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/vemigomurifokumu.pdfIn PDF document text
    • http://mon-cmbretagne.com/73840266155nyh16.pdfIn PDF document text
    • http://allostar.buzz/bufajowaparaganukadofulovm3b6w.pdfIn PDF document text
    • https://begosibaluta.weebly.com/uploads/1/3/0/7/130775163/937283.pdfIn PDF document text
    • https://kezofufilulo.weebly.com/uploads/1/3/4/4/134488682/0f67fa063.pdfIn PDF document text
    • https://vepoxiwoja.weebly.com/uploads/1/3/1/1/131164136/c6af5282bb51a6.pdfIn PDF document text
    • https://cdn.sqhk.co/fabetojowuje/gcijo7g/miraculous_ladybug_cast_new_york.pdfIn PDF document text
    • http://ketrovk.xyz/mukunoxireparigenigufoboqx6uw.pdfIn PDF document text
    • https://bebibamo.weebly.com/uploads/1/3/1/4/131438385/f14d9e593159f.pdfIn PDF document text
    • https://cdn.sqhk.co/jalotenabo/djeNjc1/76517942702.pdfIn PDF document text
    • https://cdn.sqhk.co/mofisozulud/ijjbhbK/54321946033.pdfIn PDF document text
    • https://cdn.sqhk.co/lukumuzu/hijhfgc/subway_restaurants_for_sale_near_me.pdfIn PDF document text
    • http://connexion-amelii.xyz/igloo_retro_mini_fridge_rede7t17.pdfIn PDF document text
    • https://dowawanezezezo.weebly.com/uploads/1/3/1/0/131070762/ea412.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/257e1035-66bd-4435-a49a-f1aa291dbd79/41358362929.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af0909a9-766f-4959-a150-7dda741c18b3/kogerisikikezuraso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d2a2c9b-9ca4-4c0c-8ce3-94cad915a2e5/how_to_use_peavey_sanpera_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ecf7f32-a0a7-4772-9d16-81efb5deafb5/digital_humanities_and_it_ucc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/045ef43f-42d0-4d6d-8b90-14e0cd1fe182/degim.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10253 11096 bytes
SHA-256: 64852ed074caf866e69b0dc68a57832634a530fd096e62c9a87e89377fb55ffb
font_01_sfnt_off0001275f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275F 5512 bytes
SHA-256: 3c580c14cc26a602c865194afcf2d18f4620345f38e57a2fa11126fa4e436302
font_02_sfnt_off00013a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A31 11532 bytes
SHA-256: 7fa516afaf3569c30069d89ef3e64760c096afe3b7fec671de8e6cc46644ba4b