Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fba802fd440ce73…

MALICIOUS

PDF

83.3 KB Created: 2021-09-12 10:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 88af2654542b489346396eae733ee19a SHA-1: 6b7e970fbf678ec1e94a0abc5754ae95261fd678 SHA-256: 7fba802fd440ce735251598638293da30cba87b22f8b61842173eba4aa2601aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file 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, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the nature of the PDF and its numerous embedded URLs point towards an attempt to redirect users to 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 http://tetrafluoro.com/upload/files/fepiwapetunosin.pdf In PDF document text
    • https://seeyounow.net/userfiles/file/peruz.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/puditafemezosopidatoz.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/gijekabeweduxalorabebusaf.pdfIn PDF document text
    • http://fsanaq.com/upload/file/2109120156098828777275y6wgctew.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/fefazoponumamaterudi.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/81872036598.pdfIn PDF document text
    • https://medpressa.ru/files/file/xajigipixedid.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/masopubagagumesoralagu.pdfIn PDF document text
    • http://albertf.madteam.net/ckfinder/userfiles/files/jofepuxupinubugupud.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/nabafidojewapok.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/55731696962.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/52537224415.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/24159048761.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310b68bae7d---42142335765.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/gidiworanixaniwebi.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/lutavaxasezaxomaweta.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/2509668599.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/zodawadoxonene.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9a9a186cd279dbf2b441d23981af72ff/nakidaxuzesituwuwunev.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/40279262486.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/pamogobito.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/64354497137.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/40652269822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=5+minutes+to+kill+yourselfPDF 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_off0000e0fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FB 17892 bytes
SHA-256: 43924ba1d28aa604442e1ca627f52269b9e34fb3d145430f0f6b6b47bf1220ab
font_01_sfnt_off00010f6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12783 10556 bytes
SHA-256: 5eec8cc2379db6102fb254325923958918412740561f4979fdec399d77cc0e1d

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