Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4a41af0dddc09c…

MALICIOUS

PDF

69.8 KB Created: 2021-09-14 23:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3843e7311e796d19d9634e37203fb899 SHA-1: b31233dc212bfae713e00e0192418091d71f9828 SHA-256: 8c4a41af0dddc09c153e1e5ac9463ef3639b59b2252cc24f6f21777d02e0e7b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous embedded URLs pointing to other PDF files, with one heuristic identifying it as a link farm on disposable hosting. The PDF structure itself does not contain readable content, suggesting its primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ms2gacor.com/contents/files/gigatumorubeponepazojetu.pdf In PDF document text
    • http://ssatripoli.org/userfiles/file/miberoravo.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/72735921911.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/65742617534.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f360897975---75682968036.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/paxigejatefupedopiko.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/parakuzofemitugevedajepad.pdfIn PDF document text
    • http://geodez.com/pliki/file/musunadoxozepozu.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/vulivegutetitu.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/56750255652.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/1582976519.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/kokajodanive.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f94cc08d6d---nedorex.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/tarodojukizu.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/56349879547.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210902020054.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/xoborowobomomikedaxe.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/xidexiki.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/kenuj.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/sejijevuz.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/malonufozazebavijaponogab.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/1642278147.pdfIn PDF document text
    • http://videlec.be/ressource/file/62208530947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=leonard+susskind+quantum+mechanics+the+theoretical+minimum+pdfPDF 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_off0000b2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD3 11180 bytes
SHA-256: 23eecd9aeae73bfc21e90e591bf4fc2881ab5061f105bc4573d2f4139f100fbd
font_02_sfnt_off0000e489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 14640 bytes
SHA-256: 12e64588cae02dd891f4f8212eb0e46037d4acaa52338602a4848121e46d7f21

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