Malicious PDF — malware analysis report

Static analysis result for SHA-256 94841e9f9a9febd2…

MALICIOUS

PDF

75.6 KB Created: 2021-09-17 10:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc200c7d3b568de8e4c923a72a945bde SHA-1: 81a4c5b308b05348ad8e58f89bcc23ee3b443b3d SHA-256: 94841e9f9a9febd2a0223defa0b828c3becc11d04abadea286e19c9a0aea193e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The PDF contains numerous external URIs, many of which are linked to disposable hosting, suggesting an attempt to distribute malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it is designed to trick users into downloading further payloads, likely through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://themalc.org/files/file/jizosigedupobiwi.pdf In PDF document text
    • https://flomogroup.com/upload/files/redulefunadazatebewofu.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/25004264004.pdfIn PDF document text
    • https://partnermind.cz/images/files/4015014086.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/35481230504.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134d0a7dc831---bovofududa.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/48223621862.pdfIn PDF document text
    • http://ceiling.holcom.vn/webroot/img/files/lotorevuruvutib.pdfIn PDF document text
    • http://meskerjager.nl/media/files/80210963910.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/vugepiliwisunare.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/bomiregexira.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/panivubupelixafemiwar.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/pedujizenamamabuvoxo.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/veneforelituder.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/25993655360.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/63803177621.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/41437481521.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/mujakewota.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/zetuz.pdfIn PDF document text
    • http://fortwashington.abwingsmd.com/uploads/files/pagetulonexilegagom.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/demoreruvadinenodowakid.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/fujobe.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/popodinafivelikaxikutib.pdfIn PDF document text
    • http://consade.com/userfiles/file/nidanugoruwesipumofeno.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/wuzamejikes.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/78658877404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=download+play+store+updated+versionPDF 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_off0000c55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55D 16404 bytes
SHA-256: 6113182dcb2b853b6cc2b4d60971876f649c48094ab65f4f3ecd30e3b2257c42
font_01_sfnt_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10779 10752 bytes
SHA-256: 0e6835819e2f1b753ad399c7843f58e094d5168fd1bbb2bab045e797e7f360fe