Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2762f495e36dc0d…

MALICIOUS

PDF

68.0 KB Created: 2021-09-10 07:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9a082f58c7eb0716f59d7a9bbd82d4e2 SHA-1: 931cdd3f90244f0152d7d11872aa09eb008d839a SHA-256: c2762f495e36dc0d9ad068859404b84ffc1338a6d88daac0c453bbda5f5f7735
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a phishing lure due to its small size and image-heavy content, typical of a screenshot used to hide clickable links. The embedded JavaScript likely facilitates the redirection to malicious URLs, as indicated by the numerous unknown-reputation URLs found within the document. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://anninh247.info/upload/files/75744306619.pdf In PDF document text
    • http://kennycojewelry.com/userfiles/files/202108/1630448926.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/94265089191.pdfIn PDF document text
    • https://grancom.by/upload/docs/zoxerinonitonaraxexumab.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/xajuv.pdfIn PDF document text
    • http://synhbio.com/upload/files/52009891127.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/50109846633.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/31871178038.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7bc960147---70013414384.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/2224891985.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/zurilosisot.pdfIn PDF document text
    • http://inphilong.com/upload/files/64467505987.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/11330331457.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/bejuvujawatav.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/totag.pdfIn PDF document text
    • https://trystsalonri.com/images/file/96093342194.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/nodig.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/59730362466.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/loxojusoto.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/13215680070.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/51740720790.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/67531975519.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/81411856682.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///22002533764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+restart+android+tablet+without+power+buttonPDF 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_off0000aef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC702 14120 bytes
SHA-256: fea29b6fb11ba0cdeeef0a1088d737c14fbfe93abe32e8ec3fa9ec5a20ad3be9
font_02_sfnt_off0000e958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE958 10808 bytes
SHA-256: da1dcc3f8d398f917390fd68b36a8e7e588dfe93b70c824ada9ac743b489d050