Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be42584f52cddf2…

MALICIOUS

PDF

71.1 KB Created: 2021-09-16 12:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 90c7ca350f6e945adaeca1193aa77314 SHA-1: 1aedf3a7c310b29d1859f101f237afdbedae760a SHA-256: 1be42584f52cddf21d380ac63546452b4543e9d7bacf6c7f61b36ffe4f774204
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous external URLs pointing to other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting and UTM parameters, common in phishing or scam operations. The file's structure and embedded URLs suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://allytemp.ru/uplcv?utm_term=tagalog+words+starting+with+ge PDF link annotation
    • http://ronaldtan.nl/images/photo/bosisetozosixurapev.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/54972005569.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314cf58d8f9---jumaturalokedotuka.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f950c40630---bodobusi.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/jojak.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/bikenotipifigetajotevedav.pdfIn PDF document text
    • https://bselink.com/userfiles/file/wazizixetitag.pdfIn PDF document text
    • http://clerus.hu/files/file/manususokewawozu.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/95602846319.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/gamomur.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/naxevolanilelomag.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/zibegugelivaxinilaxo.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/81352527386.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/dopug.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/lipepokepusozir.pdfIn PDF document text
    • http://yuha.be/_files/file/vurojikipinosineb.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/menota.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/rasub.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/pikozegafifozodap.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/fanilapoxuwufejigibagit.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/dezew.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/lepanifuvisalimikesidubu.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
stream_004_off0000f876.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF876 10576 bytes
SHA-256: ead96c7fa1c66d5fe253bc4a1183c0e859bee98e87a0c41c0cd56c1523ccca67
font_00_sfnt_off0000b72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB72D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3F 16160 bytes
SHA-256: 8eafb1abb1646d77e082a5981e2bd37937053ca960f46aac001115a3fc02210e

Open this report in the interactive analyzer, or submit your own file for analysis.