Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a106b615d36871…

MALICIOUS

PDF

78.9 KB Created: 2021-09-21 20:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 452587b70e59f0bcaf81b4eea0949d79 SHA-1: ff72f91ebd032d0ef5e6b652c45c795d9fe6e50d SHA-256: a5a106b615d36871203fc503a24cf2c8b3b528b1fcf773ff91447b2bdfde0ffc
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to disposable hosting, indicative of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malicious content. The presence of embedded JavaScript suggests an attempt to exploit browser vulnerabilities or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=windows+7+rog+rampage+64+bit+iso PDF link annotation
    • http://telegid.tv/userfiles/file/nevubalinejumem.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/69821927127.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/pawobifuvuwudabozabox.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/fubevujuxojaja.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/66291125923.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/92226989656.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/5237648653.pdfIn PDF document text
    • http://gucaoyun.com/uploads/file/061413058799.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/dajotuxepujumosu.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/66979779202.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/dironuvomo.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/77747937025.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/96498917154.pdfIn PDF document text
    • http://baove24h.info/upload/files/fasipizuxanabozaxe.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16144be48539d9---tanejuzisamuvidajepaluzep.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/89581659113.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/92502309304.pdfIn PDF document text
    • http://matras-devison.com/upload/file/81930048041.pdfIn PDF document text
    • https://eniedu.com/data/file/20210916020621.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/xamalejaluxitujitafurin.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/79137528103.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://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_off0000c8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 19096 bytes
SHA-256: 5df5cf2b0413c11c997148c1b724e035898ceeee3c2d9da64e4e51e332889d65
font_02_sfnt_off00011390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11390 11204 bytes
SHA-256: 1a48cbe77f96be9b6df409153c9815955575ea915a194981a3659f9d068e01d6

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