Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a59ead4a5df698…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 04:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f2774916d11725b8d6c06ca247eaba8c SHA-1: 05340f96b31f84616c8fa4f1101a25e8519d982b SHA-256: f3a59ead4a5df698c1cc4d4c7140d8f32c7801dfb322d290dc1a163a4db47a78
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to facilitate the download or redirection to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://wastran.ru/uplcv?utm_term=mini+militia+all+mod+apk+download PDF link annotation
    • http://ronaldtan.nl/images/photo/govinalegagofu.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210916_091953.pdfPDF link annotation
    • http://aiaato.com/FileData/ckfinder/files/20210908_F07454A053EE1925.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/a6mkpuae5476itqgook587hpo7/41774550540.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1614025516359f---28826518480.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/58934256116.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/448365914.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/volesefu.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/dezejug.pdfIn PDF document text
    • http://cpviettin.com/upload/files/49725770646.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/rabilesilikamefajenaxag.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/21356750955.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/muvoxagujumaja.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/taganujepixowipuvum.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/tafesiki.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/risuxaku.pdfIn PDF document text
    • https://33mobility.net/uploads/files/nunanekode.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/dobedutuzuzejuvo.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/20557331476.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/40352903218.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/pudubakok.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/nivebexazetupuvulizufolo.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/muxajopetaxivawajeno.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/nqa3clhe1tjep5aav779k99m93/xexuvotuw.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/xogusikikejivaxir.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_off0000d9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 17384 bytes
SHA-256: 978c1e6407a65cc2bd03b6c43462870f14ff232d7955e8a5c814ea086f837a10
font_01_sfnt_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA2 10324 bytes
SHA-256: e926d70204ee19afa09e2a88576b5bd36a97f55ae009183031846447130588d0