Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6150e69595c028b…

MALICIOUS

PDF

84.7 KB Created: 2021-09-15 12:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 63b634a9606abfaedeba6e0588c81261 SHA-1: 1aa6ccec68e93806f81cf6e54d998ab0506fed44 SHA-256: e6150e69595c028b4f30d58eeb329d59be6cd32566707dcd629eb7e717d8dd9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs are consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=the+sopranos+script+pdf PDF link annotation
    • http://nena-artspace.com/ckfinder/userfiles/files/povevonibunubituruleme.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16135e56d2b270---boxefirisotibifoz.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/90258184194.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/88730636225.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/rujip.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/17866471956141a731cd7bd.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210910150308_a0ctk1.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/tomiwojasalutowo.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/vugopapadavuvifabin.pdfIn PDF document text
    • https://allianztc.ro/files/file/luled.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/54841204010.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/vulakozidelefolasavimo.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358ad07667f---64578188459.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/94025097394.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/povusurexamog.pdfIn PDF document text
    • http://ranfeng.com/userfiles/file/2021-9///2021913857227777.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/34479037263.pdfIn PDF document text
    • http://imbirimbir.ru/files/zusofepefe.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/fowavu.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/40945832356.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/pojusenasivojiterewonamil.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/53665489034.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/zepomusop.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_off0000e671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE671 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 10636 bytes
SHA-256: b4184db0f862495e049f491fd312cae0b7877f1cdbf8e343e4f2cda73fe3dfb2
font_02_sfnt_off000116d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 18052 bytes
SHA-256: d6ecfebc42690f9b0b3801210fc75e155c2f6cadb9c2e377d12f19ba2ace8e13