Malicious PDF — malware analysis report

Static analysis result for SHA-256 5edd811c46c5138a…

MALICIOUS

PDF

69.1 KB Created: 2021-09-30 22:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6cf516f3af9495d5f0232154f7c29922 SHA-1: aaf09f8a01f2b24d5feb7a9a92c8d46ac97c39a4 SHA-256: 5edd811c46c5138a91feeb25d4fe6f11a2b3afbcc7697826e650876f74a0cb68
146 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it's an image-only document designed as a lure, containing multiple external URIs that form a link farm. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct reading but rather to host clickable elements.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 69 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.
  • 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://www.corazondelsol.es/ckfinder/userfiles/files/28000229514.pdf In PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/93640117565.pdfIn PDF document text
    • https://digireg.ru/upload/wesibosonaxigaxosol.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/narubewanogepa.pdfIn PDF document text
    • http://ndemal.com/publish/page/file/kobiv.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613227a8d4432---nefapiwexeboti.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/f44ac4ed25725945e92c693a5bcd7d60/42474596373.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/92360111349.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/bilefepawutodabubunax.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/vekotupugumu.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/wevawigonagilov.pdfIn PDF document text
    • https://udruga-invalida.hr/files/57903149040.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/80111981508.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/medadekijokerepujubuna.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/62813143515.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/65568895157.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/satejosoxid.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/sunofamutujoviwanukutu.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/25408415670.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/lexejagepexow.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/mupewizebirejo.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/89534119287.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/75297887973.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/77408888057.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/wovijidevup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=wide+parabola+equationPDF 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_off0000b3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A7 14152 bytes
SHA-256: 10869f27f48e918f06979e4af63eb88d85d9a330beee568a2aecd530c60a36c5
font_01_sfnt_off0000d6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 10596 bytes
SHA-256: 8f032adbd4ea6322843ab8f4e3e8c44d993860195ebe9ef30d4136646d2c19bf
font_02_sfnt_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1