Malicious PDF — malware analysis report

Static analysis result for SHA-256 1715a585a5389452…

MALICIOUS

PDF

73.3 KB Created: 2021-09-19 09:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 192066c4ce5b8ae22ebd9a9f6312ddf6 SHA-1: f9077831f718f961dfb861db5e3c9b8a9366293d SHA-256: 1715a585a5389452a53140bbe6796847026750fc5f461dc563ea36adc7cfc4b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to external PDF files, suggesting it functions as a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this redirection behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://xyoaa.org/sites/default/files/files/47709119509.pdf In PDF document text
    • http://abwingstop.com/uploads/files/ruvalejegujowepomajuvimen.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/wukawijijedidunalezenax.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/nuwiveruzam.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/nadovusude.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210905_56A2DA8992D4B66D.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/76086134415.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/pivezenutazaxepu.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/17953743593.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1ee50eb2effe315688b7f67971814926/43304772105.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/xibisamopijetifugubase.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/zogomunutuboj.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/23874542626.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/roxere.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/xanapanadedobetalikibojov.pdfIn PDF document text
    • http://unsersohn.ch/images/file/timopabegeledisad.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/86234099765.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/91880556672.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/wilil.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/wojibonotivepuzivi.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/bedonalolujuj.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/84329004978.pdfIn PDF document text
    • http://liily.jp/upload/file/20210916093502.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/25442823613.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/07f89f81a0c7361ad17abcbf015a1364/vujoporarekutupogufomog.pdfIn PDF document text
    • https://razredna-nastava.net/files/nuzajebivines.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=subway+surfers+link+to+playPDF 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_off0000bd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD3F 10956 bytes
SHA-256: 5a5c9c48f8cf44eb844ef8650697cfbb9e16df5486b7fb88b826277beaeb6be0
font_01_sfnt_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 16156 bytes
SHA-256: 7df32a135a65b0d921a1c7603ec5bef58299307fa352e684175a81bb69c33aa3