Malicious PDF — malware analysis report

Static analysis result for SHA-256 af72e8e76952fbcf…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 05:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe859d12d5aef39621098a960fd18667 SHA-1: c2dd77dbab7115be11024b33550ff1d36eaf82d3 SHA-256: af72e8e76952fbcf51092a7034239b32f6f1331acf6ab63b171c60da68c639f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links pointing to various domains, many of which appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest an attempt to redirect users to malicious content.

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://smidgel.ru/uplcv?utm_term=android+pc+connection+settings PDF link annotation
    • https://akrmedia.no/ckfinder/userfiles/files/zanefobefezup.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/6760596175.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/15843191864.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/kowimuwabebapo.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/xululeramoxofigezad.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/jutidepomudorevejidigamol.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/tapadaniwuwatonope.pdfIn PDF document text
    • http://czyxchem.com/upload/files/54549874976.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/kexegijopujapik.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210905042552.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/jigubofawuzimifi.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/22997446865.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/9092500459.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/43604030802.pdfIn PDF document text
    • https://ever-progress.com/upload/files/vasuzabibaxisev.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/piwetu.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/18367500387.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/73964854737.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/pipizu.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/59020147687.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/33377972470.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/najexaxogebofegilaraxov.pdfIn PDF document text
    • https://www.soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images/files/teneguwusatix.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/bisubetiwefazez.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_off0000e0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B3 17992 bytes
SHA-256: 2ddae2705a48ea3806343d2e02a47f25abf748992cd92b7be1290a53e8729174
font_01_sfnt_off00010ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001270b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270B 10464 bytes
SHA-256: 1d6f54b730f30734c81b47d1c02b1803aad65300ede01ca1bda83c4c69c2716c

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