Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b2d6df434971e3d…

MALICIOUS

PDF

79.7 KB Created: 2021-04-26 15:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 3950b21e826db37928f0aa025483188b SHA-1: c06a4ddfeca965b63dd7a60f99907a81e677bc32 SHA-256: 4b2d6df434971e3dd4d346f08da65120e117be00a5ac6396938fd4e37546ba5a
226 Risk Score

Malware Insights

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

The PDF contains embedded links and a document body suggesting a password reset lure for 'wd my cloud dashboard'. Heuristics indicate a link farm on disposable hosting and a password-protected archive lure, commonly used to bypass security scans. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jacksth.ru/strik?utm_term=wd+my+cloud+dashboard+password+reset PDF link annotation
    • https://cdn.sqhk.co/zifixanuk/heAjhcn/my_talking_tiger_game.pdfIn PDF document text
    • https://kivuvuvilex.weebly.com/uploads/1/3/2/7/132741385/jeginegumo.pdfIn PDF document text
    • https://lomofoxagut.weebly.com/uploads/1/3/4/5/134524577/gulilabefifut-zikomorodoxul-vixaladuvukibu.pdfIn PDF document text
    • http://santecmb-sarl.com/casper_test_preppy1ny.pdfIn PDF document text
    • http://robinmani.site/diy_it_costumellyk3.pdfIn PDF document text
    • http://fartook.online/278973650476gm4u.pdfIn PDF document text
    • https://sogatetemurus.weebly.com/uploads/1/3/4/3/134379625/gewilewemodivaz_vefirafubot.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/1jbXI12/11474697076.pdfIn PDF document text
    • http://grinallex.shop/nora_rubber_flooring_installation_guidewulu4.pdfIn PDF document text
    • https://cdn.sqhk.co/sewujuzanas/cjedjab/domogesulinejavavofinogas.pdfIn PDF document text
    • https://cdn.sqhk.co/zebapomiz/YhjqNlI/1250465823.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xufujofaleki/16587603647.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/45592787416.pdfIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_0f326186142542babc531945bdada609.pdf?index=trueIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_19ded901840c4838b79943c26aaa03fe.pdf?index=trueIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_b4f2f619afba438c8f4021f7245ea704.pdf?index=trueIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_c170607e144441a7aac414723a1b7200.pdf?index=trueIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_91f1487c79134329991673bac2efc0ca.pdf?index=trueIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_01ec36d107484fa8bcbf69cb44e13150.pdf?index=trueIn PDF document text
    • https://9f9bd9fa-00fe-4673-b34e-9a629881f524.filesusr.com/ugd/09273f_5002cd30a5ef479db5da7d56d1aa3fac.pdf?index=trueIn PDF document text
    • https://02796127-04ec-4c85-b270-c6f7310ebb18.filesusr.com/ugd/ce0e6d_48f29fe8eac24118842717f85bea7eb9.pdf?index=trueIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_bc6b57923266469ab34641b921d34d1c.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 5388 bytes
SHA-256: cd4f4cfa754bcb9ce8fb8f06132bd4541368ec08f3dec8fd4bc05b8e9721116f
font_01_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 10388 bytes
SHA-256: d0879fdcee94e277fd87d7c6d39bd20f5c84983bfd21567a20fbd1a8f468dd35
font_02_sfnt_off0001232d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232D 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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