Malicious PDF — malware analysis report

Static analysis result for SHA-256 7514d07027f0ab3c…

MALICIOUS

PDF

87.8 KB Created: 2021-09-12 21:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b55954a9e4dc8f118b5afdfd35855bd SHA-1: 0539abb2e0e2cc6fc9d76e0be3479332eb01c942 SHA-256: 7514d07027f0ab3cdbb596ceea3811bccec138e6e8f9e8621975ba5947b2b80e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a medium-severity rule indicating it's a link farm on disposable hosting, and a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous embedded URLs, many pointing to suspicious domains, further supports a phishing or malware distribution intent. The ML classifier also strongly indicated maliciousness.

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://silverstonedevelopments.com/ckfinder/userfiles/files/67789543520.pdf In PDF document text
    • http://hondaototanan.com/upload/files/25734785843.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/lekak.pdfIn PDF document text
    • https://igescanada.com/ckfinder/userfiles/files/sidol.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/sepaduzunezuki.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/29430072590.pdfIn PDF document text
    • https://legend-chang.com/UserFiles/files/nenagirelonotalejulivom.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/66225569320.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/lizepigadewiwor.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/regakekalosejubekiton.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/maxivud.pdfIn PDF document text
    • http://tano-cable.com/d/files/laboxelovofigirotivugop.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/16544559027.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/niwotakexetapidak.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/43241100806.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/limujavojinadamabape.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/88452836036.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/daxijazus.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/92923671125.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/56182689550.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a2b39b88b---zowojuvesezesezeked.pdfIn PDF document text
    • http://benly-carson.com/product/files/supenijiwomufujorakojalu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135fcd19b242---zipikikixo.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/zupur.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/15549638883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=tekken+3+apk+latest+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_off0000f298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF298 17828 bytes
SHA-256: 43c4fd8aa926c3c3302a0d0c825c83086942a98650390484951032fb7b99c71c
font_01_sfnt_off00012149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13960 10540 bytes
SHA-256: b0308a9e5e7f8518643a15281c6d6d7b253e2f87f1486aad3ccc1073e6d283f4