Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff82795febd5104…

MALICIOUS

PDF

78.1 KB Created: 2021-09-21 01:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76e0ddcfd7e58674bcbfe81da9a434d5 SHA-1: 39931ce2c322323dee78a06d9f5d467469cdc7b2 SHA-256: 8ff82795febd5104665460ca322f87ed527d32f481c5e26e55c85f4d1e60e656
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are hosted on disposable infrastructure. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://artgallery.devctn.com/ckfinder/userfiles/files/24210720212.pdf In PDF document text
    • https://jager-ig.tw/up_photo/file/weduzapezomutewapuzoluwex.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/pulop.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/42238235370.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/66543198080.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/72433123288.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/17393867173.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/23579024867.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/45093180682.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/mozebivirazezalaxufarojux.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/04b92d77bc6da6121d1904652059e6db/99475556067.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/7399608126.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/tavozulokar.pdfIn PDF document text
    • https://allianztc.ro/files/file/66542142155.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/lumebarizatetopetenujimek.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/91944845459.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/35842709340.pdfIn PDF document text
    • http://dobermanncz.eu/files/93771456397.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/86793558863.pdfIn PDF document text
    • http://www.agot.pl/upload/file/52850531825.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/suruxukomaj.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/mikemilofomukes.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/xasekenupodij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=gensan+zip+codePDF 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_off0000ca29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA29 10360 bytes
SHA-256: 47d4b5d7f5b6df94e4e5a9ec7eac51631be3a704f4ebea34fc2d6be74577863a
font_01_sfnt_off0000e1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CF 18900 bytes
SHA-256: defdd7d3c02025eaeec38959f1d37df372252f9eec1dfd7b4b13286aa4cecb84

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