Malicious PDF — malware analysis report

Static analysis result for SHA-256 817122ae5b79e848…

MALICIOUS

PDF

74.4 KB Created: 2021-09-19 21:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f87c5601796acdb1692648fd84c58163 SHA-1: 67d6ab681f431095c5096c7d0176877702d81fef SHA-256: 817122ae5b79e8489434b79b8fe9e07c956fb09a283173089891ed567ee1aa69
126 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 embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a likely attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://bringem.de/wp-content/plugins/super-forms/uploads/php/files/a62b85290646022675802574baeaca8e/gebomosibalutatikazunozuf.pdf In PDF document text
    • http://bubb.cn/up_file/file/linolajasewa.pdfIn PDF document text
    • http://www.bash.cl/media/file/teruvime.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/86815731257.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-09-05/images/files/74322196501.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/86213689619.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/subikukovofixopewoxodijar.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/87978357047.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/84867951169.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/bepizidadogevijog.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/vejemavubujozidanipufoku.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210901_075319.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/71492516934.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/49729473201.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/16179453927.pdfIn PDF document text
    • https://ptogel1.com/contents/files/28293722861.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/40365425968.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/67510444347.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b0f69db69---71732737694.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/lomunavalilaki.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/gorafupasuwofopugesebo.pdfIn PDF document text
    • https://ka-base.no/images_content/file/lepigivemafikozibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+ip+address+on+my+phonePDF 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_off0000c258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC258 16080 bytes
SHA-256: 8327d2e0d696366c17dbc886a04b8a09bdd06abbb65ec9cb34eee96135fecf0f
font_01_sfnt_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 10720 bytes
SHA-256: 4ee27bc91c8a6f06c488c876fa79569523cf06630d0112555d2a6c4de3c88549

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