Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff1ae8f35092a65…

MALICIOUS

PDF

72.9 KB Created: 2021-09-24 06:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 63cfb7b7157b8b5331bd35496055dd12 SHA-1: 10976251f9e3ab2a4fefca7581107af6e92bd1f5 SHA-256: eff1ae8f35092a654bcc69bbad4836a063d799864be1d45bdf830b676c1b7bc0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to host a large number of links for deceptive purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://firsatpin.com/calisma2/files/uploads/21164988548.pdf In PDF document text
    • http://lamorenj.com/userfiles/file/28590998266.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/3077319938.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/260726278.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/37700979606.pdfIn PDF document text
    • https://businesslife.com/content/file/dutedetulabade.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/pugavelela.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/sagesopowesasonidimagop.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/84864630829.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/sabekofovarijifuzo.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/19736170269.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/kuxisagikusabur.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/85157059934.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/99282784439.pdfIn PDF document text
    • http://linker-apps.com/files/96182575340.pdfIn PDF document text
    • https://windscrm.net/files/file/10965860611.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210915_6DF3378BCEBD8CEB.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/wufexitizexuzumo.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/bawej.pdfIn PDF document text
    • https://interconformity.ro/images/file/kevifebapatujigoxo.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/41181911817.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/fikes.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/85587040265.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/rawojavepeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=loop+a+video+on+androidPDF 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_off0000bdb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C7 10096 bytes
SHA-256: 276f34c28db58180c53539cc1121f2415eb1ab2f86078f06c5024b675071434b
font_02_sfnt_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 16212 bytes
SHA-256: 96b44408e2aab86a017f3e656f61887231f46134cd18a4c1e74edd66c7486001

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