Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf5aea3d7a040c7…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 23:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 781ba200d2274d12fe081435789c9798 SHA-1: 93a86b4d6620b30c097fdcbd1292e7f72d34178f SHA-256: abf5aea3d7a040c71a6ecc5509d608786c9d26b7ca733d262465021c3fba14bb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=how+to+recover+a+lost+fortnite+account PDF link annotation
    • http://traslochimontalto.it/userfiles/files/zuzizaxek.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/79068073351.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/92794777115.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/1aac510b2b1714f4cacee143f07da582/kukalozopegemu.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/51680940614.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16148d8491d11a---tawudu.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/44549282.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/gogidamikurojekinuvaf.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/kodasurolapok.pdfIn PDF document text
    • http://bndweb.nl/upload/files/tumovifinemi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zotivojurila.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/wevajepetefemipusejixut.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/lapulemoperinew.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/26006225752.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/87919283064.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/32864294668.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/zebutixazasadazize.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/fuwafotelenubik.pdfIn PDF document text
    • http://metzgerei-bischof.de/userfiles/file/xaveruganepubizozotixatin.pdfIn PDF document text
    • https://stvorki.ru/files/file/55293640730.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/zobasakaxisufid.pdfIn PDF document text
    • https://tekartltd.com/upload/files/82021851258.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/83592686979.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/rurijoneneb.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/fakavosu.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_off0000d8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F5 16928 bytes
SHA-256: d0f839c7174090ec67dcee9260439214ebf7ad143075ab60c3919135a6abb7e3
font_01_sfnt_off000104d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE9 10572 bytes
SHA-256: 65bd4874a550ee3ff3b80f6c345c081d417261fbfe07eafedca48d4b988dc348