Malicious PDF — malware analysis report

Static analysis result for SHA-256 acbf8b83d4f249d9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 18:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb18fc8e4cf3b89851c1022dbec6df62 SHA-1: 8cf1bd4953b93074c92f206ff5289d7ae5fff251 SHA-256: acbf8b83d4f249d981859a852fcd050ff1eeb1a867cd8026841518c98dc0b8f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with many pointing to suspicious domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this by identifying a link farm on disposable hosting, a common tactic for malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hankilfood.com/upfile/files/wujobesosawilanotigoxu.pdf In PDF document text
    • http://files.ibiza-ferien.de/file/84472658554.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/gavotafazonojemelo.pdfIn PDF document text
    • http://capri.lt/userfiles/files/megatikenon.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/basajumibipupozotegokule.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/93592197153.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399992bb554---14985844539.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/81487330745.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/32356413798.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/rudodoxomuzodutuduxinu.pdfIn PDF document text
    • http://abwrva.com/uploads/files/vumetokodaderoja.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/71903949405.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/8260214565.pdfIn PDF document text
    • https://coil.hk/upload/files/batesinumujuranovo.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/situf.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/bubivana.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/fiwurutol.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/4047028764.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/fuxaloludowituxixukixaraw.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/94258673289.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/0tl4ioeo7023gta13phe91f1mb/mesakifofifojinudafa.pdfIn PDF document text
    • https://premium-house.uz/images/file/83918471880.pdfIn PDF document text
    • http://abpaluso.com/upload/file/tekejenaworobi.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/3704735790.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88187932927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=2d+and+3d+shapes+with+examplesPDF 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_off0000dc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1E 17780 bytes
SHA-256: 309df5b48460ad5c2ddd8343903c9d1368ee4216ab8f59fbd0bed231941eb10f
font_01_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 10820 bytes
SHA-256: b99f2c150ee3d40e18c9c255ac0226f78941f5f348eb2fbf797346f317f15b18
font_02_sfnt_off00012320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1