Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2e233b562a8d6d0…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 15:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e273cbc5ea8051c591ada689cf86af8e SHA-1: 9ba229324d464fbef6e2aee52d4c073169595a43 SHA-256: d2e233b562a8d6d0d39fd3eca3c67e93284b90080adab8a2fac0ac96c7c6bc1e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains multiple links to external websites, with one heuristic specifically flagging a PDF link to an algorithmically-generated URL. The document body, though heavily obfuscated, suggests a lure related to job applications or resumes, indicating a phishing or malware distribution attempt. The presence of numerous external links points towards the document acting as a gateway to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ketchas.ru/uplcv?utm_term=cover+letter+for+sending+resume+in+email PDF link annotation
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/38042663179.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210902_025233.pdfIn PDF document text
    • https://kaimano.it/file/tejademijerobu.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/84115835490.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/fumalupik.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/wekogakajigunuzugitufug.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/wuxupeberuxobarojosep.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/7540547292.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139703478c01---naguboto.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/gejarokekilosumaxekip.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/luteraruxow.pdfIn PDF document text
    • https://thepainter.asia/upload/files/xejebojoletolugejosaxi.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/labezerosinibum.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/nukulaxadevumiwuput.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/sowaxaruluzinef.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/32093730269.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/61156331099.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613996d480b7e---62206404585.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/vevovuxabeduzej.pdfIn PDF document text
    • http://www.buildonhope.org/file/74586585063.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/pozufuruxada.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/wewodevomosiba.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/67277713534.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/49065394812.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/45394809354.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/nedokerurepaje.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_off0000dba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA2 16464 bytes
SHA-256: b5338cc0e28df49fe97ee676f25d5006a92fc107340630e6e3e2d1626cc4632b
font_01_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6B 10896 bytes
SHA-256: 0aa71cd341d04041d242a080cdb45e03ce9c75c2ebba710f32c3325b4fa3ab9f

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