Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bcf2dcd693619f9…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 17:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 9058fda2b9f3ed7e122d78a09f7eae74 SHA-1: e470e49832884d4d39b1432f7626cf21a4d478bb SHA-256: 6bcf2dcd693619f920dc70a48a084581d644574dcdb8d8ced883aded0ed829d5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://styropapex.pl/userfiles/file/38626302454.pdf In PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/63783111645.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/fivitatigoriduwumaroja.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/10591441269.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/kefamivudegare.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/zajilusebavasetof.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210909112107.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/91169686603.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/buguzefa.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/xurizuvib.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/36874399172.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/fagubisalan.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/46588038816.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/sibolev.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/80354429467.pdfIn PDF document text
    • https://motecx.com/images/file/jumibanesevekib.pdfIn PDF document text
    • https://cargotavio.ru/files/file/rotoxugexodigojezinek.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/95824251323.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/82578230722.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/32530546211.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/lelomu.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/lavitebaxupotamu.pdfIn PDF document text
    • https://kuepancong.com/contents/files/mijitotixalefovoxotuzi.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/felefarotuxojokepuda.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/58143686971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=persona+3+portable+social+linksPDF 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_off0000d351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD351 17820 bytes
SHA-256: f16c2eac58dc23a96ccbb1b1b881a7af7dd5242e3dea9cf124531dd964454096
font_01_sfnt_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 10772 bytes
SHA-256: f8b26c361a1a4c9afa79eae3ad8f9fd437f49f27879d035a6b8b83a7f29ac5f4

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