Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b0b06dca0ea9e4…

MALICIOUS

PDF

69.4 KB Created: 2021-09-12 07:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 45a0f63cb1ed8e6cdba8b0d998213d7d SHA-1: 919a1558a3f9a618187c877d3d5d25db701d8b02 SHA-256: d0b0b06dca0ea9e4087101393541a162bbb92ca2578ccf1d36e12bd6769f6f67
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious content. The presence of external URIs and embedded URLs points towards an attempt to redirect the user to download malicious content, likely disguised as a game, as suggested by the 'utm_term' parameter in one of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=download+gta+san+andreas+on+android+for+free PDF link annotation
    • http://ladyvenus.it/userfiles/files/nanadagokuwamesog.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090718595273499.pdfIn PDF document text
    • http://asliev.coco1490.com/upload/file_folder/file/begatitudanumirivuponubu.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/bebetujoxorajagemuro.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/zanuwuzovekel.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/meluvusutamunogaxum.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/42969c549999f18f268b768df921c84f.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/moxijibax.pdfIn PDF document text
    • http://thedreams.cz/files/3735858211.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/dabixufesojixuzexomediti.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/mirulutelemakasaxiv.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/zetemapagexudiranapaj.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/rakesikibesigaranoxejuku.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce9d9c2bf---71489952777.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/kemamowobikululavamuj.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/996104094.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/89585989679.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/54491783686.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109101248311482.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/48362647529.pdfIn PDF document text
    • http://medrea.ru/upload/files/toxemizokotufonatetajaku.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/paparenonaludizefija.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/43596787353.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/muxikasirot.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_off0000b37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37A 10616 bytes
SHA-256: b9fead16d76daef93267a37f55b28b24b50b87ff64469914c6a78d91d276dc0a
font_01_sfnt_off0000cbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB6 14472 bytes
SHA-256: 0536a0874d3ae83936c63d897b278af58f2bc69f0313e8de214321798ccd8a0a
font_02_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1