Malicious PDF — malware analysis report

Static analysis result for SHA-256 900b57b696552c8e…

MALICIOUS

PDF

87.8 KB Created: 2021-09-19 18:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5756d4c13ca62aa726d38e7554095506 SHA-1: 0ca3f2fe1b18cc42eb54a6e56a79ddae4cfc50a0 SHA-256: 900b57b696552c8e51ee3dbe1d65fe3437957a128c895f60e14be24eedf45981
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of embedded links pointing to various domains, many of which appear to be disposable hosting. This behavior, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a phishing or malware distribution campaign. The ML classifier also flagged this PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://smidgel.ru/uplcv?utm_term=best+app+to+read+books+on+android PDF link annotation
    • http://youandisagenix.com/ckfinder/userfiles/files/wovimebiwo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/44545399589.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/suwimasezuzak.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210909062428284361.pdfIn PDF document text
    • http://pasted-radio.de/web/files/tixoxidavil.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/kunipebavapes.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/de89ce4526e964f6c2a7b79f7846b0b8/zurobegakexewitizixowi.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/tapifatijebijanido.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/zikowobejetawizerus.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/pamokenoradajadokuf.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/95570873555.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/dazepoxomokodov.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/74259682630.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/27091038022.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/vebanuvepamowusomo.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/81099377592.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/33760392897.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/zofisewix.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/9987947600.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/rijatoboparavemesosedox.pdfIn PDF document text
    • https://semut73.com/contents/files/sikaxutudagoti.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/remam.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/84289705042.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/736754844.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5b1108945385a855ff8c0584e53f61f1/tudelesozixadurobuzir.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_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF7 18084 bytes
SHA-256: 8d74329a363c8fad83c3a2abd2c2d94b613db9d6dadcdfaf19b810d9bf6085bb
font_02_sfnt_off00013961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13961 10624 bytes
SHA-256: 5337c0b8adb2caa2bacd36ca21ee8fa4640c58852cf8f629a244b25a8b2950a5