Malicious PDF — malware analysis report

Static analysis result for SHA-256 38df72aba5d28b76…

MALICIOUS

PDF

68.7 KB Created: 2021-10-03 19:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0bebabe399b1a4c97d29327b7c9a30f7 SHA-1: efa4b7516d0c997c1fef01875a8b1b7e735f013e SHA-256: 38df72aba5d28b7683f3d27f820074a73c7b2b40d5ab5cdb58d7aa9f0d8b45b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and a link farm heuristic suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cremyco.com/app/webroot/docs/file/20805805309.pdf In PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/81306905221.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/16130030609.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/97454326107.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/bikamabujalajogejotige.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/26052873306.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/xuleku.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2839e5d49---25326934499.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/mipolomugenev.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/90724288150.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/56338267972.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/53900805286.pdfIn PDF document text
    • https://ms1oke.com/contents/files/29082301381.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/roxibagijadanebevimi.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/29319004676.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/94797836916.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/75556140768.pdfIn PDF document text
    • http://teakdeck.pl/files/file/82698255281.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/dolazawebi.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/dexedelalemalera.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142966a64f20---sufimezolepisa.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/60204447801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=metronome+different+time+signaturesPDF 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_off0000ae3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC653 10744 bytes
SHA-256: 1b69c303cc431a6ea0da7be1132f30aec7de526c95d347dfd39020f2f4a2d026
font_02_sfnt_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 14604 bytes
SHA-256: 3b74373f6fd85ffff0c358b08fc607d70e7d58e85b2f6f809b4300081961a4ba