Malicious PDF — malware analysis report

Static analysis result for SHA-256 1499d0269a808762…

MALICIOUS

PDF

72.6 KB Created: 2021-10-03 16:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 30b2ad61dbce1fa794e72572aa57387d SHA-1: 7e6fd5658208581dc934169722847c9a238a7b3b SHA-256: 1499d0269a8087629c600fcb4b9cdd310e85f440d1cfb2c6b0f3e797f78cb678
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to distribute malware or facilitate phishing. The presence of external URIs and the 'link farm' heuristic strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://infrive.ru/uplcv?utm_term=overt+disparate+treatment PDF link annotation
    • http://ljjxmining.com/uploadfile/file///2021091817013534.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/refovi.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/35666441835.pdfIn PDF document text
    • https://curvy.tw/upload/files/96436274677.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/getovusimamaraxoxuzog.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/nawojifigemafedawubu.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/depupaxikikuko.pdfIn PDF document text
    • https://wittnebel.dk/file/xoxakiwiwolaxe.pdfIn PDF document text
    • http://jnejendomsdrift.dk/userfiles/file/32861724509.pdfIn PDF document text
    • https://techlan.pl/files/file/jodexalumorog.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/59284214531.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/20521528504.pdfIn PDF document text
    • http://msiutilities.biz/documents/jezekila.pdfIn PDF document text
    • https://thehouseproduction.net/file/64208195272.pdfIn PDF document text
    • https://amgaa.org/temp/files/4089642419.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/17025569220.pdfIn PDF document text
    • https://ijpdua.com/contents/files/jozezulizufedofisisoz.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/73352391670.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/57259618153.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/32146681611.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/45921135176.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/fojesusopotug.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/4c3ef6b0dc4e733ae4a4435ebb9cdfe5/61425684271.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/9833858263.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/5913277831.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_off0000b77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77A 10480 bytes
SHA-256: 54f4c5a9ae1769d3dce9e7a8dd627ff615c31b3283605e2934a4bcdbe75dc833
font_01_sfnt_off0000cf5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 18056 bytes
SHA-256: 1e319ae76d6a1b44c1d8770999d7758a519b3d3a062df9073b2a8292466731b9