Malicious PDF — malware analysis report

Static analysis result for SHA-256 928e72ba73394394…

MALICIOUS

PDF

75.2 KB Created: 2021-09-13 15:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c17149e7a3243d13a3b6b3fe9c9469c9 SHA-1: 61647637c851420dd9ef5295014d2b02cc11b0ca SHA-256: 928e72ba73394394d725057a6fb4c4b46170673c0bd06c567f02a9aca155109a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, suggesting a distribution or phishing campaign. The presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious sites, likely for malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=zank+remote+apk+for+android+tv PDF link annotation
    • http://fszhenjia.com/upfolder/e/files/20210909140417.pdfIn PDF document text
    • http://honda-vo.com/upload/file/pixukofazojizugudifazixi.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/kaseba.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631217411.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/kefegujejamafisi.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/99755020414.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/setenem.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/21503790488.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210908_985549E5F825378D.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e587cfa341893a91c533eab3dea31239/60981219536.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/24035478630.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090907060051.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/ziwulepuzema.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/ragazuzuleliwuraxezen.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/89863852819.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/mawinifawekakizu.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///vexavasatus.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/didutoloserogekewomodaf.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/6734874371.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/selidunemufejanaxaduvi.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/sopitawekafodexevu.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210910181141.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce01f33251---xinipuwosadore.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_off0000c4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DE 16424 bytes
SHA-256: fc9b9ed375cd4bdc5089e975f39081db29b79ea78aced309107d8f620a8a15a2
font_01_sfnt_off0000ef39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF39 10568 bytes
SHA-256: 770fd3cc22223a22cd302e89f51e4204f811aad741275fff01024dc74fc5feaf
font_02_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1