Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d38f6364c9e48cd…

MALICIOUS

PDF

82.1 KB Created: 2021-09-12 19:11:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe1c592259c8dac42ceea5fa283569b7 SHA-1: fb90552dd309d4e56b1fb745e19830e169cc1c62 SHA-256: 9d38f6364c9e48cd0e8462834e842d7f1ecdf21e3ab47e727c6e316e4be50b1b
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are algorithmically generated and hosted on potentially disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious content, likely a phishing site or a download server.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=download+damon+ps2+versi+lama PDF link annotation
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/pezabixitivawe.pdfIn PDF document text
    • http://fteq.ru/files/file/11848760163.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/33202620603.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/jawomave.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/84289448451.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161368261222a6---gagesuk.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/xegogavirenafepivomimen.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/46495630325.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210909181809.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109092138049781.pdfIn PDF document text
    • https://emenu.hu/editor_up/36216772230.pdfIn PDF document text
    • https://notarbrazda.cz/userfiles/file/In PDF document text
    • https://mauspro.net/upload/files/powonovijafekotujeneb.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/352215631.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/70770790589.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/gijatuxuxukemubes.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/20605183367.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/naduluduveseb.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4c7d25dd3---61600598389.pdfIn PDF document text
    • https://gilboamedia.com/userfiles/file/bologonokajijuvo.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210912095828.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/xilise.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/28698498008.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/dekugasuxopuxelaf.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_off0000dc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC00 17760 bytes
SHA-256: 5c958ff839bfe7491b1eb907c21f450df10dbafacb36e042d72fecd7a78d7e31
font_01_sfnt_off00010a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001228a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228A 10728 bytes
SHA-256: ca483ce14d0d3810d295cacb59e0a33ef58e6d9e65135f0d95f108dcd2919047