Malicious PDF — malware analysis report

Static analysis result for SHA-256 5932748757a7c873…

MALICIOUS

PDF

79.8 KB Created: 2021-09-21 08:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd2b3215bc2b983541c25b416c57cf42 SHA-1: 19cc30145fd76c85d825fb97c0dab628df360bd3 SHA-256: 5932748757a7c873f1bb3b0c1f985847619674fca662491095b161a8f626e054
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with several heuristics indicating a link farm and the use of IP addresses in URIs, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8207ad942---25841061036.pdf In PDF document text
    • https://fnb-concepts.com/images/uploads/files/66832311213.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/12132063458.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/jubalo.pdfIn PDF document text
    • http://ymmicro.com/files/files/38479199772.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4c5c39b0---susirajudofagixidarorofep.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/tugopoki.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/24073036870.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/12051599937.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/87365604179.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/wonigoxujutolagu.pdfIn PDF document text
    • http://hzqzg.com/d/files/6599836692.pdfIn PDF document text
    • http://artcvajk.friendship-match.com/upload/files/wezorofobedamigusosogeva.pdfIn PDF document text
    • https://shibbirs.com/media/files/duxepelawudutoru.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/fepurawaxa.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109131946039403.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/93413425683.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/96749960103.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83908534170.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/31878553784.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/jaxadajazefosimavasus.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/rarofedabifanazup.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/fawuguworupolerexavasoful.pdfPDF link annotation
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+stickman+legacy+modPDF 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_off0000d349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD349 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 10908 bytes
SHA-256: 92b48c57e7e3ae84ed6da21d60e566c9605b3bd572381f7f679f6243110001c5
font_02_sfnt_off00010477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 17580 bytes
SHA-256: 9023fc94f86a1b2398d2c2920b66282dbb4f4b7b2d644b9fcf57c1cea4fee323