Malicious PDF — malware analysis report

Static analysis result for SHA-256 765ae85d9a52a0a1…

MALICIOUS

PDF

69.5 KB Created: 2021-09-13 13:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d05cc71536c6b3d926e742940470d82 SHA-1: 7f3594ec5d3b2cb1afb47018ad5e9b2aa6a9820c SHA-256: 765ae85d9a52a0a19568694a824eeb6858a5b783307a8760c55348426b49b5b7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains. The primary purpose appears to be directing users to external sites, likely for malicious activities such as credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://safetypadlocks.eu/eurostyl/photos/file/8266593390.pdf In PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/88358808994.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/93838263164.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/fafuluxifesumuni.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/14093180585.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a91d64cdcb---lajane.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/bomilamirex.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-10/20210910225104635452.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/20776681603.pdfIn PDF document text
    • https://tebra.si/userfiles/file/xusokutipoxulutirexem.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/33668245800.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161366a0c25d05---monadipet.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/wanezererimivadufujuge.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/kigujobe.pdfIn PDF document text
    • http://syekp.gr/sites/default/files/file/80616455384.pdfIn PDF document text
    • https://anjingliar.com/contents/files/36510792742.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/29813010528.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/zeguboz.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/wejunejenojugis.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///lupebamekakaxiwokuz.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/daxedenamikuwejed.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/81827479333.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/nupusasokametafazufe.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/bekidejakujupone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=english+phonemes+pdfPDF 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_off0000b3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EC 14752 bytes
SHA-256: 8345352d65a3d9d57e11b116ff59dbff02dd43a7d73d66ce47296e70770223e2
font_01_sfnt_off0000d89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B2 10568 bytes
SHA-256: 2036569549251117c34b0eaaa43c1a43465fca8de8be66fcf91c05074b3f6923

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