Malicious PDF — malware analysis report

Static analysis result for SHA-256 a22db1011d8cd830…

MALICIOUS

PDF

77.1 KB Created: 2021-09-12 23:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bdbbb1c052bf23e996f570b501d297a4 SHA-1: 3234e56fb3e717b1d2a97bf2ecc617545b99ec0e SHA-256: a22db1011d8cd830eb88c6bac593289c45444e9346bd4d6b25aef66771f2ac9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to phishing or malware hosting sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to obscure the final malicious destination through a network of disposable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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.
  • 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://eastmanllc.net/ckfinder/userfiles/files/vaxezorazikozijimosede.pdf In PDF document text
    • http://aylabawadi.ae/userfiles/file/wesunejujatuxetu.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/nezetofujimibeseradakat.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/22893316855.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613a22675479f---3958576655.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/mikobeso.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/luzuvorad.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/tirerudininetavagabu.pdfIn PDF document text
    • https://duragloss.pl/userfiles/file/levogisuxeperizaxix.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/44265249798.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/piwafapusogu.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/3764792953.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/93616531174.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///sidepesitowisuxux.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/goxugiwenemimi.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/87585371224.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/putumibewilutem.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/76110747207.pdfIn PDF document text
    • http://alkanboya.com/files/file///39722030082.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/dubapipakakefadov.pdfIn PDF document text
    • http://happy-land.hu/editor_up/73660167027.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/vosotivisejavegorurix.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/damotevasowegiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+use+ttf+file+in+android+studioPDF 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_off0000c69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 18552 bytes
SHA-256: 0517ff3307588591176b41eb55e1a18a8fd781a2011d9cfda61ce655df03a119
font_02_sfnt_off00010ee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE8 10524 bytes
SHA-256: 5af089bbc57dc4a512725b6794cd99aaf45e1333e2de2f6a757a73cc196ca860

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