Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf869751bbcef1a5…

MALICIOUS

PDF

77.2 KB Created: 2021-09-30 13:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 771b262fe00137c9c36cdbf9807e101c SHA-1: d76929ab11b54d5c07d21ef539b3a3c7e008f56b SHA-256: cf869751bbcef1a54a17cedec2869f1801e57d997779901d0b2156bd8315a1e8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=chrome+app+shortcut+on+desktop PDF link annotation
    • http://laserbeautymachine.net/d/files/sovuxotifo.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/91184777933.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/61732463400.pdfIn PDF document text
    • http://kdbelektrotechniek.nl/uploads/file/20759190269.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/85104691588.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/54874735394.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/89192094895.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210901_4E70C3E22274B2EA.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210906192411.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/93312365332.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/58494479624.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/19834362796.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/86581423643.pdfIn PDF document text
    • https://hojoairport.com/images/file/zezulolupuxu.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/92387022117.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/3892354056.pdfIn PDF document text
    • http://devveb.net/userfiles/file/xoxapetagipozikomipu.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/mirobemososone.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/82626088004.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/98465814732.pdfIn PDF document text
    • http://goldway.jp/upload/board/file/fezujavaxubaxane.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/kedetimoduberuburura.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/pumalivizemegejapefebure.pdfIn PDF document text
    • https://mediaskills.rs/files/79297235047.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/61238340313.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_off0000c4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E8 10864 bytes
SHA-256: 4ac6ea4c143c698a84d54390f9259186706897cef4de525875cf5d86730ad9c6
font_01_sfnt_off0000dde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE5 18968 bytes
SHA-256: 61df91cb717d890d4834aee4cb8e3239d3786cdf752924c2929e70235dd0caea
font_02_sfnt_off00010ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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