Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c2fb65cc73dbb52…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 16:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 7f7cead49584ef8e6517bb2df208bc43 SHA-1: d3fd1d7c9fc6726b00d8927c921da17ee44ff5e4 SHA-256: 0c2fb65cc73dbb52267b0ee62598027d915b0ad9ab1324fcc14a8fe02164831c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://gasthaus-steinkirchen.de/img/editor/file/72764309869.pdf In PDF document text
    • http://crystaltrade.hu/data/file/fivuzafavivadamuvuga.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://dulichgiahy.com/upload/file/gomediba.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/tufaduguni.pdfIn PDF document text
    • http://royalgroup.at/tmp/pibewat.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/viwaxenexoxulix.pdfIn PDF document text
    • https://zenithservicos.com/userfiles/files/14046071.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/loguzoboravimodokifowaja.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/tutavijim.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/dosapinunujupeguxoto.pdfIn PDF document text
    • http://keacg.com/upload/files/kurunoruk.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/68700158535.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/9894811372.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/fonivosos.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/15208700620.pdfIn PDF document text
    • http://carbontuning.ru/file/71348752550.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/10851939836.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/35323161367.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/repigegozavana.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/63520331492.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/diduvoradavopuwizolomufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+io+gamesPDF 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_off0000cf2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2D 10300 bytes
SHA-256: eb025e9f30e62d70457211805291036504159c1373cb6963d81c4339cb99679c
font_01_sfnt_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE77 17804 bytes
SHA-256: 617c48bb1a9b303698a1b587c643ab25f0998ef27b039183180be899d5290e26

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