Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca41740c13b414d4…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 08:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8726b695b9991a2265c9272dd11ad1ea SHA-1: cad1bfe900c6facd3076b10e4adf92bfc90fa2a9 SHA-256: ca41740c13b414d4aff1581b08717382742300e3698e0bf9cf2301287b3f5895
146 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 external URIs and IP address literals pointing to potentially malicious domains and an IP address, suggesting it functions as a link farm to distribute further malicious content. The presence of embedded JavaScript, though not fully detailed, further supports the malicious intent of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=babel+novel+mod+apk PDF link annotation
    • http://galerie45.com/userfiles/file/rezalojam.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210926_002415.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/43547093169.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/dukifogonojagevin.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/614efe47d2b3e.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/13575405144.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/78326689562.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/75241640158.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/58135413318.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/82292721681.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/bikuxufikasigalutopuwep.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/fadedanaxorabanusile.pdfPDF link annotation
    • http://atel-j.nl/uploads/files/soveporuzura.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/jesan.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210924035244.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/42464568368.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/naxoramepaxokawizegomi.pdfIn PDF document text
    • https://vnycc.com/userfiles/file/witovezada.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/sawed.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d795deae9c73a5b6e22467c34bc6a749/98662189702.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/36955459621.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_off0000af9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AD 18116 bytes
SHA-256: 589e4bcaff65eab31a9939a53b30f9f05ad9d666ab88598214ba359f67f58303
font_02_sfnt_off0000f60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60C 10448 bytes
SHA-256: 424128ae01790f95cddab1b85381779e8929dda9ea0f8556d8ecffce37386c3c

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