Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fa274b368ce918…

MALICIOUS

PDF

74.4 KB Created: 2021-09-28 12:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ca30b95bf8f32959603c753f2c30c568 SHA-1: 97b4a50884afb18e52502ee3fed1108bfadec183 SHA-256: b4fa274b368ce9180a63b2fbcaf7fe721b96f276723d73153573d09f20ec4aa4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high number of distinct hosts and links, suggesting an attempt to obscure malicious destinations or engage in SEO abuse. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://heninrealty.com/userfiles/files/82583823702.pdf In PDF document text
    • http://busankid.com/webfiles/board/file///pipudizozomopukivebol.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16145d6e5b041f---berigoxetorejejufo.pdfIn PDF document text
    • https://self-storage.sg/images/uploadedimages/file/zikitenugowesaweke.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/zadilezirekelotowatepimu.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/16233065505.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/87415872767.pdfIn PDF document text
    • http://capri.lt/userfiles/files/tilarisomaga.pdfIn PDF document text
    • https://sy-chemical.com/UserFiles/file/rodurokupasorepo.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/rulirunu.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/tizexasutu.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210924193535_mi6w7d.pdfIn PDF document text
    • https://hoavily.com/uploads/files/97980422571.pdfIn PDF document text
    • https://askflip.com/uploads/files/18817562561.pdfIn PDF document text
    • http://zerosquareonline.com/file/kozomu.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/ximevuvij.pdfIn PDF document text
    • http://wjcopy.com/upload/files/39256053918.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/47232181191.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/67706702976.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d101c32261---58466933674.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/suxide.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/57497071620.pdfIn PDF document text
    • http://kco.su/userfiles/file/28845506789.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/sokunabuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=is+7+composite+or+primePDF 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_off0000bee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE2 18160 bytes
SHA-256: fe50df178c4029ff1340324aeb3600a0d23e7cb1c1cb801381cda13564cd9373
font_01_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 10224 bytes
SHA-256: 0f1773b8dcef8a48f1700e0429508563e6f448f1f84c82bef18eb5b2815b67b3
font_02_sfnt_off000103d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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