Malicious PDF — malware analysis report

Static analysis result for SHA-256 35cd4cbf667a27b8…

MALICIOUS

PDF

73.1 KB Created: 2021-09-13 03:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7b4f3ed67788de5e8a3bc5f0cee622f SHA-1: 15ac66adf166787f77ee61a5056b595637f989a3 SHA-256: 35cd4cbf667a27b812cd5ffd4ce90a7cc928c4c7623f9718150c329c241e0502
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous embedded URLs forming a link farm, many pointing to PDF files on disposable domains, suggests a phishing or social engineering lure. The 'download app vault' UTM parameter in one URL further supports this, indicating an attempt to trick users into downloading potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://extrastyle.ee/ckfinder/userfiles/files/55871822866.pdf In PDF document text
    • http://eska-lift.ru/userfiles/file/pibegan.pdfIn PDF document text
    • http://esipro.be/userfiles/file/84317437028.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/nelovapavukakunimatiwev.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/namikadonaja.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/22212610198.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/95474896000.pdfIn PDF document text
    • https://ayurmitra.com/files/file/56095042830.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/pejaxikotomofevirisel.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/30291772631.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/77074301733.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d3560b8c1---64663551167.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/91583152569.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10165009610.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/bonog.pdfIn PDF document text
    • http://ping-property.com/user_img/files/78872713232.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/xetixinatojumenu.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/34136305953.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/rivesutikek.pdfIn PDF document text
    • https://cubic.is/userfiles/file/74057081595.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/50270332155.pdfIn PDF document text
    • http://synphabase.ch/upload/file/lanifisinowezug.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/4765947873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+app+vaultPDF 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_off0000be0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE0E 16348 bytes
SHA-256: f24f2114cf0cd68f8579ce5a56c00cb627956efbde1d427862a2277688dcf6fa
font_01_sfnt_off0000e852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 10144 bytes
SHA-256: 4c53c4c65edc105dffee8e96f6c4e4cb87f9e2c5eff85a343303a357a6e522a0
font_02_sfnt_off0000ff25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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