Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc950812ea8e979a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 22:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4595692877a82ad4e141e15e7d1069b0 SHA-1: d203fb367b0c59b43c8d6e79dd5a4b1c599168d4 SHA-256: cc950812ea8e979a5c6637888ca1958f098b96a917d6e167525475e242639af0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and one specifically identified as part of a link farm. This suggests the document's primary purpose is to redirect users to a network of sites, potentially for SEO spam or to host further malicious payloads.

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://transport-vehicules.fr/userfiles/file/kisorosavivorewu.pdf In PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/89603037194.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/wisikifina.pdfIn PDF document text
    • http://a899.net/userfiles/file/wuxanok.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/wudapuxisanavijemije.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/xuzedizuziti.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/vonipopu.pdfIn PDF document text
    • http://kangmeideyiliao.com/uploadfile/file///2021090419030411.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/virotokokuvanixizizajidid.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210911155919.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/nipujoselasokuvamutuxosi.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210916091202.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210901_317E393008A050AF.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/tikawati.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/wakorevovikex.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/fomokebetuvidinu.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/43654827.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/gakujorozixix.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/pakonojakeror.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/velojosunu.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/65075753258.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/makepixujasof.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/27316356186.pdfIn PDF document text
    • https://dcimx.com/files/40119373619.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/72e631c94818b2251cd85b4c9e58f1ac/rinefetegunutusuxixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sreekaram+telugu+full+movie+onlinePDF 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_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 17272 bytes
SHA-256: 5e75be7e994dcb9582bbc7be5756ea1e1499d3a3c44a1e912a47bf089926e0ab
font_01_sfnt_off000105bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BD 10720 bytes
SHA-256: 5b53ed42b318d0ddd5f741d7ae5a8873d8f11928a416715b3b80f7c95f97645c
font_02_sfnt_off00011e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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