Malicious PDF — malware analysis report

Static analysis result for SHA-256 af595d4d70506ebb…

MALICIOUS

PDF

72.2 KB Created: 2021-09-20 07:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 27bba7ab037511298cc1455107112611 SHA-1: 4241021f12e6bd9eb3995ac4e5ac297c33c190bd SHA-256: af595d4d70506ebb66801dfb04f4ef976e3ac50215216f4c5648cca786bb3d18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded URLs suggest an attempt to redirect users to potentially harmful content.

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://sevvalturizm.com/rsm/files/49056275509.pdf In PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/17558847702.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/jetawunazipixobofewukonor.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/5072374831.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/wurugeto.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138a0c97b6ff---mapofo.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/83578525226.pdfIn PDF document text
    • https://j26clean.com/upload/files/21110527768.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/3919623226.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/18000162892.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-19/20210919135423390220.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/satijosus.pdfIn PDF document text
    • http://373113.linker.tw/files/47916022003.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/jikotap.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/nivesezinenosafoneruj.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/36971270871.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/numovokafudibavazinotozom.pdfIn PDF document text
    • http://etre-belle.su/images/file/87908454369.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/pimikag.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/94798264811.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mefobupaguvokosaruj.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/kenegudekibu.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131926239066---nuxotoxovebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=new+jack+city+watch+onlinePDF 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_off0000b715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2C 10460 bytes
SHA-256: 249e4a27544c5381055a77c4b2e4d93eb1521d2c845cd2bdf4cfef6cf20e99b4
font_02_sfnt_off0000e6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 17708 bytes
SHA-256: fea19e8cba4495081a4bfdeeb151a2d540f023428213745565436eb169aa0096