Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae2e9d6ff6cab54…

MALICIOUS

PDF

70.1 KB Created: 2021-01-27 01:34:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0474513b613f9f8946639cbf2f85223c SHA-1: d295699038b4a4d48340fa93d1b93f1fbd773c31 SHA-256: 9ae2e9d6ff6cab54e251dbea6e8926c082bdd82db8d8339c252ef157136a611f
186 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It impersonates Gmail to phish for credentials, using a redirector URL to a malicious PDF hosted on weebly.com. The PDF also contains numerous external URIs, suggesting it functions as a link farm or downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://kivisibef.weebly.com/uploads/1/3/0/7/130775328/datodol.pdf.
  • 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://leonvi.ru/123?utm_term=perimeter+of+a+semi+circle+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451352/normal_5fd7d57e7f283.pdfIn PDF document text
    • http://heliusdesign.ru/recargar_paquete_amigo_sin_limite_telcele97n8.pdfIn PDF document text
    • http://alex-chekalev.com/world_war_2_timeline_ks2ywnvm.pdfIn PDF document text
    • https://kivisibef.weebly.com/uploads/1/3/0/7/130775328/datodol.pdfIn PDF document text
    • http://lakshmi-store.ru/mcculloch_chainsaw_3516_service_manualnttxv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484623/normal_5ff69cc85a6c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371807/normal_5fccf18121cc0.pdfIn PDF document text
    • https://gubilipolijig.weebly.com/uploads/1/3/4/7/134707964/4116588.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/carrom_3d_game_download_uptodownjoc8e.pdfIn PDF document text
    • https://vogavova.weebly.com/uploads/1/3/1/6/131606390/3644244.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482847/normal_5fce79b4726a0.pdfIn PDF document text
    • http://pressit.space/texas_thrift_store_jobsez1sf.pdfIn PDF document text
    • https://tetagusupawuwag.weebly.com/uploads/1/3/4/5/134586179/rupisafatagis.pdfIn PDF document text
    • http://cherrypimp.online/flip_jump_stack_apk_mod712bw.pdfIn PDF document text
    • http://batmbatm.ru/sonnys_restaurant_in_chicago8upw6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zenujasope.epizy.com/79147865931.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE7 5280 bytes
SHA-256: 77e48e07424c385bf395e427b28eaef12e0d9ce49bf5a11c6817d02c27a8f263
font_01_sfnt_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 12596 bytes
SHA-256: 3d4d0521105205870d98efe04b056000559bffa01af79591a838bd59e712630a

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