Malicious PDF — malware analysis report

Static analysis result for SHA-256 94de1e5f60c361a0…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 07:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5eb8be06730859d28b45f172f8414ce5 SHA-1: 922da5213c8c04d9f09e0a8dbacca31983324522 SHA-256: 94de1e5f60c361a05347018a855d3b0ef901d9cda3aacb03671d9e90d6c8ccb1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, but the presence of external links and the ML detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=best+smartphone+assistant PDF link annotation
    • https://nmg.lv/img/uploads/files/denebubavezuwunaga.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/10616703650.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/57144900622.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc5b43950a---zeturoremonanozolepudoso.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/xesidal.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/digukilomenodezopimikefax.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/taparerapisiguzinekir.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143677c29e69---surilovufaguka.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/28326505562.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/fulidaxatopuwagi.pdfIn PDF document text
    • https://citronel.com/userfiles/files/43021676258.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/79416764110.pdfIn PDF document text
    • http://myphamasia.net/upload/files/kikuxelomalawobelomup.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/gavoxuzoti.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/32470553882.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161426ff403b01---baxikut.pdfIn PDF document text
    • http://plise.org/userfiles/file/dafenivafenonuto.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/zatuleniserejedif.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/gitid.pdfIn PDF document text
    • https://seger.cz/userfiles/file/lunafomixusedigavamojodoz.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/fasumowesefefaku.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/93920065453.pdfIn PDF document text
    • https://ka-base.no/images_students/files/kuzodidexepuwog.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_off0000b105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB105 18136 bytes
SHA-256: 6a0abd094e0283c0cee60e0b77fb94ff27786c3bd58bee5fd3b6ab469e8d66ce
font_01_sfnt_off0000df19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF730 10524 bytes
SHA-256: 31d97ecf7cc7db8dc10c7c54ef2e3ac81bbc368c67e7c0018bad2f7c111db09c

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