Malicious PDF — malware analysis report

Static analysis result for SHA-256 d967af4a64d6565b…

MALICIOUS

PDF

69.6 KB Created: 2021-10-03 14:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8cce357bbf1b8ea65e9e0644f53760da SHA-1: acb1af2d2e56cc981dc70897b203a7aa86174d8f SHA-256: d967af4a64d6565b80f1bbac292de10db30133f348d136286cef5d1c7d6cdbdb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, many on disposable hosting and using UTM parameters, strongly suggests a phishing or malware distribution campaign. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=spanish+regents+study+guide PDF link annotation
    • http://tiquital.com/documentos/file/lojuketutotuse.pdfIn PDF document text
    • http://macro-e.com/app/webroot/userfiles/files/gemet.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/18287139833.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/38372329963.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/munaje.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/kirevipuzasite.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/gefiritisorejozadexa.pdfIn PDF document text
    • https://proxus.nl/file/37106619569.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/tudaferolakojabowuzesu.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/xevajugalirubapodibul.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/puwel.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/58649493361.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091609342573499.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/40946488372.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/teragonelixudowatixade.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/54887448300.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/rinibixetaz.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/73235170358.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6a6af4cd86f5d82d5960c920a498fc41/zodazivomuwese.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/wilirevemonibefosadog.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/36437398541.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314836c9ad6---4526169395.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/rizigakuvuvidelura.pdfIn PDF document text
    • 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_off0000ae33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE33 10796 bytes
SHA-256: 20707aa4290c139243427016340a9c1c53bf0665da7d342ea313f9fc88c9c980
font_01_sfnt_off0000c6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D2 15832 bytes
SHA-256: 0b2e55c62ad89e27d898c5bf99bf54791950bcf9b160913dab6f979340fddf35
font_02_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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