Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb660782ce512eae…

MALICIOUS

PDF

72.3 KB Created: 2021-09-09 08:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef292574757fc5be91c7706c59222d00 SHA-1: 792371a46dba70e577e2438a715ab8fb898e2de7 SHA-256: bb660782ce512eaeaf10a79d4de8fad61ae1142467b8e81f39879570eeb8b217
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or scamming operation. Although no scripts were explicitly extracted, the nature of the embedded links and the ML classification indicate a high likelihood of malicious intent, likely leading to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://krisoc.ru/uplcv?utm_term=enterprise+marine+careers PDF link annotation
    • http://leaguengn.com/userfiles/file///56903248334.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/10654831142.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/vuwirusarifusidun.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/50303848653.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/75190655492.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/1025711699.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/zibenawimevodetuvikejig.pdfIn PDF document text
    • https://hinaweb.com/upload/file/89926932092.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/84938674924.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e19feed33---gedukiki.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/kijanalenisutuwazale.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/xupuvu.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/bejinixugotilukuvil.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/wezupunatarapuzipu.pdfIn PDF document text
    • https://defi128.com/userfiles/files/vujigobok.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/rinelubukowa.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/lizovo.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/geriwu.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/lujajobiwapaz.pdfIn PDF document text
    • http://citra.cl/userfiles/file/ziwobagerisapo.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/fujorijinixuk.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_off0000b6ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF04 10352 bytes
SHA-256: e6d8aa5f00768e5f1761208a85a49dd0169b44f2a331ac2f7652113a4b6f22fa
font_02_sfnt_off0000e65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 17012 bytes
SHA-256: 9909667a4a77e9c44d512e49f482512f4e7c2b6da3063928981b1621c91bb3a2

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