Malicious PDF — malware analysis report

Static analysis result for SHA-256 eac6f2fb861e573c…

MALICIOUS

PDF

76.9 KB Created: 2021-09-09 15:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17b0328b76c3eb12d818d590cf350f30 SHA-1: 4a664f482073ecf01f2a10a75a18bfbb21adb340 SHA-256: eac6f2fb861e573c60445f1fe044fca3f9b3d8b738be55a9497396dfce6d462f
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

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://coretry.ru/uplcv?utm_term=clip+reward+hack+apk PDF link annotation
    • https://norservis.com/files/files/90639153562.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/rotejobonowobuwejedur.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/pupuwumefazixaxevokajap.pdfIn PDF document text
    • https://superpart.com/files/vewapegit.pdfIn PDF document text
    • http://delve-cr.com/uploads/donizuwipesiselunem.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/51617968146.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/bogutizukukasezusalida.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23884040906.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/50413460097.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/95896479024.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/xuxuvoduz.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/parijoxobugovakuvonigone.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161348f1d9740b---jasalogev.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/1997658222.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/20798953783.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/rodaterolopaga.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/18323982092.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/79956385580.pdfIn PDF document text
    • https://ms01bet.com/contents/files/noboniron.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/bodugesitisunipope.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/88504932558.pdfIn PDF document text
    • http://fitviewer.biz/files/file/19776672629.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/83382806012.pdfIn PDF document text
    • 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_off0000c831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 10332 bytes
SHA-256: 680d9b2904ba95fc317e9ca5eb4a0fe6d7d7bd1f2263ad4b0a37105bb0a9ea8e
font_02_sfnt_off0000f7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 17884 bytes
SHA-256: 870081ae4787238252735b52febc808dc57edf95226491def196bf3b310b1e4b

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