Malicious PDF — malware analysis report

Static analysis result for SHA-256 98ca5ea85baf6c64…

MALICIOUS

PDF

91.4 KB Created: 2021-03-16 13:24:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fccf980de7b0e495ac687f223d23300b SHA-1: 7aefdfaeb847e0a21aa8e3b3ef82a71f744192a9 SHA-256: 98ca5ea85baf6c64f61eacbd86750549f870288c97c9512fb4e6ed35349b5f46
164 Risk Score

Malware Insights

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

The PDF contains a lure related to editing bank statements for a job, combined with numerous external links, many of which are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. The presence of embedded URLs and the 'SE_INVOICE_LURE' heuristic suggest the document's purpose is to trick the user into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://seumenha.ru/wix?keyword=how+to+edit+bank+statement+for+job
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/2005891.pdf
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/7209673.pdf
    • https://static.s123-cdn-static.com/uploads/4377116/normal_5fe5ae76be887.pdf
    • https://static.s123-cdn-static.com/uploads/4415739/normal_5fcd661da6cfe.pdf
    • http://pabesubibo.66ghz.com/amsco_united_states_history_and_government_answer_key.pdf
    • https://static.s123-cdn-static.com/uploads/4409818/normal_5fddcd8f5e71f.pdf
    • https://cdn-cms.f-static.net/uploads/4501991/normal_603a1d8312bba.pdf
    • https://cdn-cms.f-static.net/uploads/4403954/normal_5fea09a261f48.pdf
    • https://rovepegolotiru.weebly.com/uploads/1/3/4/3/134319415/janux.pdf
    • http://ranurunubaduk.iblogger.org/read_overlord_light_novel_volume_14.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/30611cd4-4d0c-4839-b584-1c604d647217/didibom.pdf
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_85d504f7ff1e4fccbf7749289a3c4d7f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/deac869d-7911-46c0-a61e-8dac13bd6108/inferno_dan_brown_price_national_bookstore.pdf
    • https://uploads.strikinglycdn.com/files/5f943dee-097a-478b-be35-a6077468d212/what_does_unconditional_positive_regard_mean_in_psychology.pdf
    • https://uploads.strikinglycdn.com/files/e6eb52a4-ef3e-4ad7-ad3e-6dc4a8c92875/76979206360.pdf
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_f6bed7860fe4459388ede11e36663474.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1e38d52a-c340-4386-be66-86b1a83c70da/what_are_overhead_expense_accounts.pdf
    • https://uploads.strikinglycdn.com/files/d85e8e9c-84ec-496b-8b4a-acad89566edd/1988_ezgo_golf_cart_parts_diagram.pdf
    • http://lusuzajemofim.rf.gd/79262251707.pdf
    • https://uploads.strikinglycdn.com/files/389d49be-610a-43a6-a4cc-49cc6cf0c711/puliwog.pdf
    • https://uploads.strikinglycdn.com/files/1ac15540-5967-4eb4-8746-9ebd89e7268e/oracle_sql_case_statement_else.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011fa7.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA7 2828 bytes
font_01_sfnt_off000129a2.bin
abd0beb7722ac721f038e1f36cd8b00df9906016260796ff752f13885333242b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129A2 5356 bytes
font_02_sfnt_off00013bd3.bin
e38951f502b5af165630ea2f4b5fdd5ae79c055afdcd448e04528d590456b37c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD3 10660 bytes

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