Malicious PDF — malware analysis report

Static analysis result for SHA-256 db36a749a5b9f4f8…

MALICIOUS

PDF

67.0 KB Created: 2021-09-26 15:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a45769a1cc77be0d2ec8e8342c2792be SHA-1: 35922bdf8c9d7cba63509a6a472d474b0478dfa9 SHA-256: db36a749a5b9f4f8669e331d8ed519d329435691b551228cd9c2826090ffd2b7
86 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file is identified as an image-only lure, typical of phishing campaigns, which contains numerous links to external websites. The ML classifier strongly indicates maliciousness, and the structure suggests it's designed to lead users to potentially harmful content or further downloads. No scripts were extracted, but the presence of many external links points towards a malicious redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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 66 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://xn--2o2b17g32e8xisqq.com/userData/board/file/7769732186.pdf In PDF document text
    • https://0924055971.com/uploads/files/202109051131546160.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210908_EEDD95F4051F1711.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/feroluwakuputi.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/68814075788.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/jodidakenunijukutosera.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/55816757117.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021092414011572.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/15156872931.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/powegurana.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/94673999511.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/forasu.pdfIn PDF document text
    • https://bczenekar.hu/files/file/lenojixumubofaruvejupizig.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/1480238993.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///saxososasunoroxa.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/difolerovofokazosoloba.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131204ed47db---nilesonozusosa.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/71856767745.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/fogilal.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/76518100111.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/lesarinajelevumejuva.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/54546092487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=layer+7+application+layerPDF 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_off0000ac01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC01 14116 bytes
SHA-256: e215e626875407bf81641e672fc7f584561c445fed7c86c5d3a66486053ad0d8
font_01_sfnt_off0000cf2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE741 10320 bytes
SHA-256: 755c74e82a7d7d5657a4182ec19b17364452917005232df3b6968668aecf6226