Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13217f987191414…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 09:20:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 00817f71a91eb6f48a22abba490e087e SHA-1: b6ae7de3658b01ef06e903dabd3c3c1bddd790e4 SHA-256: f13217f987191414b3faf91d4e3908b85960324a0c72045028bceac6f9ac268c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are structured as file downloads. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a link farm strategy on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 4

  • 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://philabc.ru/uplcv?utm_term=how+do+i+sync+my+android+phone+to+my+kindle+fire PDF link annotation
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404bbb04437---tikekidajinogasij.pdfIn PDF document text
    • https://melz-feu.ru/upload/72040838075.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/79856055396.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/53004385388.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/62197989177.pdfIn PDF document text
    • https://tigaintan.com/contents/files/42910231189.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/xotagavagatorasuv.pdfIn PDF document text
    • http://taociren.com/upload/file/210907055044665751usg7vn0pypi5.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/9666288260.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/razidoje.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/vafupojizexodasegune.pdfIn PDF document text
    • http://eva.am/files/60e2831b7dd80eb6.pdfIn PDF document text
    • http://dd-eng.com/files/files/31284928808.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/kasinokemog.pdfIn PDF document text
    • http://chinahk-ip.com/chinahk_ip/html/files/editor/file/jaseva.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/85469461096.pdfIn PDF document text
    • https://lazerom.pro/media/file/59616900580.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/5052105180.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/83967438667.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/95773494606.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413e6ec9ec3---90145181521.pdfIn PDF document text
    • https://mbbs.hr/files/kusugatipudadopukifapax.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/16111774055.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/8257332482.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_off0000d67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8C 17896 bytes
SHA-256: 7e655f3adbb1d424ee805429eb975b072c2f01c7c0ac39776524c1c11edc44c5
font_02_sfnt_off00011d6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6A 11168 bytes
SHA-256: 11f2545c0d07454f971a6b6dc635a41f5c0e718e28e2744a25f79ece264a3616