Malicious PDF — malware analysis report

Static analysis result for SHA-256 620d0d4dde37ba87…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 13:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a015288fe5c18272d5387b02280123e7 SHA-1: 6ebe8ea45534995e1cfbaad851d45df3e7310c86 SHA-256: 620d0d4dde37ba87e79acded0232cb8bd04efecb08d447827bc5da489d33077c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 disposable hosting. The document body is unreadable, but the presence of many links suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://studiopetrilli.it/userfiles/files/nifovexewijorumebi.pdf In PDF document text
    • http://madmojo.com/fckupload/file/naruzu.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/88235401477.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1d8526b6---77988719724.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/ganalosigekapofijulil.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/zomivemusinuvozabej.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/kuxumigomidojabixajezuzi.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/57518758140.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/gipome.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/65013310149.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/sudifukegovobinurozuxe.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/kewidolev.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/23881199879.pdfIn PDF document text
    • http://umhouses.com/uploads/files/34008350343.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-02-23-05-03-41.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/50154725470.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/57100307331.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/xupelizuxifep.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/69441203642.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/31605238091.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/damogomojefazolozotiw.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/17387499290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cast+of+bug%27s+lifePDF 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_off0000eaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BD 18252 bytes
SHA-256: 89d0d14bb5c0c666f564fd8ef2549fb1a177b3f06a9195734147665b03bdc832
font_02_sfnt_off00013209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13209 10488 bytes
SHA-256: c266b39ddcf749a5aa7b37150533f02b6a46bc6b1bd127b78700b17b082f3b65

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