Malicious PDF — malware analysis report

Static analysis result for SHA-256 02bf3c5e27eb1136…

MALICIOUS

PDF

73.3 KB Created: 2021-09-12 13:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a62348149ca272eb736288f4760f9c07 SHA-1: 48890045e1a2e1e354f1d78df3f47a93759e37c7 SHA-256: 02bf3c5e27eb1136e0cd6227b8d4c50b2ead5faf3d91e33241db0c3bc112b331
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, many of which are disposable. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://krygina40.ru/UserFiles/File/16509548758.pdf In PDF document text
    • http://princeverma.in/uploads/files/mozanijikasesinogo.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/56843049333.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/36882197698.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/remirifejubasasafuf.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/lulefiwijuvunabeta.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/11938873850.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/36876894670.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210901095617.pdfIn PDF document text
    • http://master-vin.ru/files/file/41556667755.pdfIn PDF document text
    • https://mkontroll.hu/File/pimenolexizo.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/bokomawiwosefigenoguxuja.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/72248841262.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/pafuvonulono.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/lanox.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210907_611478ACF0CE27E8.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/duwosemekevaboxij.pdfIn PDF document text
    • http://tulga.ru/editor/files/3345729321.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/61808757166.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/rezibirerexosuvuw.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/34080315542.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/35892853814.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/50781262624.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=cast+android+to+chromecastPDF 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_off0000bcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF3 10620 bytes
SHA-256: e733488f4cdb700579858bc578611690b26ad70e0d5130466561435d3520b2f9
font_01_sfnt_off0000d50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50B 16744 bytes
SHA-256: 63539e8c00b213ca02260f01af2432332a65565108b144b9f41b82a643929fb9
font_02_sfnt_off0000ffac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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