Malicious PDF — malware analysis report

Static analysis result for SHA-256 1869d26dfd914ce5…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 00:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d00f2d26176f4f1952cf50585a69773 SHA-1: 24b30926884678f85a66dd7be9922bb1caca53fe SHA-256: 1869d26dfd914ce5f826dc7b1da65ee6a813ef99660aafef46fb31b440f871e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly supports this, indicating the document's purpose is to generate traffic or distribute content through a network of disposable links. No scripts were extracted, but the presence of many external URIs is a key indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://zajazd-broadway.pl/galeria/file/42819938781.pdf In PDF document text
    • https://pchome.uzai.ca/upload/files/xumube.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/30238550740.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/98433418927.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/famabilanerikipikef.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/73643290924.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/118d851bb05d079e0011668f3edc0f3f/92423725766.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/29882892217.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b73f3fc6a2e13bbf0b84a2f3abec24a7/3983697832.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210906_AD76468AC6DC460B.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/26287876662.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/nanejedogowegam.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/zobiziwezawomes.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/litezetagibivivalivusot.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/timomatadutagezugax.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/7046276296.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/ruwebori.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/gufomi.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/38801893121.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/50084451659.pdfIn PDF document text
    • http://didopack.com/files/4005300513.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/29639686240.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/xovoxodusumanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=mcpe+beta+downloadPDF 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_off0000b10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC925 10368 bytes
SHA-256: dab597efe0e07f05b8e6c1220af152f59cf861dc32a3aa86e80de4b9eb2cbed6
font_02_sfnt_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 18800 bytes
SHA-256: 1012b600c1295c5d0814117fe65419ac772450e29f50f9bc7008927d4c195f3b