Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7358ecfca2ebd58…

MALICIOUS

PDF

74.6 KB Created: 2021-10-10 11:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 41cab9d8d13f7cc61c65b3b69b50d1f1 SHA-1: f4da0c099e5f3ca901e42968281da6759e4daf57 SHA-256: e7358ecfca2ebd5837f7ccca3dafd569b9bf94e251137686f9eee47e2ce27171
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, containing numerous embedded URLs pointing to other PDF files hosted on various domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the link farm structure suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.mueblesgamez.com/ckfinder/userfiles/files/zexuzonararefulamem.pdf In PDF document text
    • http://imosa.asia/uploads/files/202109222051079298.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/jupovamewibuzaretun.pdfIn PDF document text
    • https://tamm.be/_files/file/39512211043.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/legebuxozenalawuz.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161498fbc12583---5847051371.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/34594108664.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/8211913224.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/81786410928.pdfIn PDF document text
    • http://fitviewer.biz/files/file/95202036894.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/vuvipuwujepud.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/diwibo.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/37873244761.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/durubelufuwadezuwi.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/repapetagedugob.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/ditotulofiresojedavi.pdfIn PDF document text
    • https://agnieszkapawlik.halpress.eu/userfiles/file/27495787212.pdfIn PDF document text
    • https://menu2uplus.com/images/file/peluwajifeko.pdfIn PDF document text
    • http://3m18.com/images/editor/files/56663577533.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/jidejudologefiwotemozidum.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/bitijexomuwenotud.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/fakatiwusu.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/zaxuwuzo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+long+drive+my+summer+carPDF link annotation
    • 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_off0000bd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD06 17892 bytes
SHA-256: 467046b27b529f87f5a045ec38f5ee1062a2026bc5890b7f7ac33b7df6c92bdd
font_01_sfnt_off0000ebee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 10960 bytes
SHA-256: 3edf76e339db048484fb3e487d8525111f367606014d81a149cf342e59c339c6