Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b77e31ab8d6a20c…

MALICIOUS

PDF

77.1 KB Created: 2021-05-30 08:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 5a66aa23f8aee0f40eaa8774014025b2 SHA-1: 24dfcb98224ec27b630a0774fe2263f464371a01 SHA-256: 9b77e31ab8d6a20c628369f774a451deaeeb5a693881fed21bbfd8ea893b02d6
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file contains heuristics indicating it's a credential phishing lure impersonating a cloud document service like Outlook. It includes multiple external links, one of which points to a redirector URL that ultimately leads to a PDF file. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into providing credentials or downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://xevekarisugi.weebly.com/uploads/1/3/4/6/134697334/gagijavanuzipupiruj.pdf.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://maypoin.ru/123?utm_term=email+template+for+offering+services PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376362/normal_60668a252fd9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446270/normal_600a225816628.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454421/normal_601484b8c2101.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413843/normal_5fecccf6619a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490269/normal_5ffe7f444168a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491151/normal_5ff9b974a5751.pdfIn PDF document text
    • https://xevekarisugi.weebly.com/uploads/1/3/4/6/134697334/gagijavanuzipupiruj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_6061d28550269.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369909/normal_603678fd2562a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422148/normal_5fcd4077460bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369768/normal_5feb9e0b44bc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406793/normal_6000003f8d549.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445564/normal_5fed925f5c573.pdfIn PDF document text
    • https://koxamuru.weebly.com/uploads/1/3/4/8/134890845/7110768.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b3f4b50-7ca1-4e88-a2ad-240de40f3933/78374929557.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/520aaee9-ae69-4634-920b-9d24d8fee62b/10514831844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd4811e-b8f5-46df-8414-da89715cfb4e/57695832955.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4c5a9d1-cd40-4c6e-9cc5-9419510ab9ef/zefofegusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/102a0131-ec66-4afe-93e4-6f0d5197b5e1/how_to_play_hedwigs_theme_on_piano_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6153c59d-0066-4b2a-a10f-e4dc096bdf79/pearson_algebra_1_textbook_table_of_contents.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_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 5352 bytes
SHA-256: f7bf30a95b0823f9de7a6c6647e7b08e6f0e35dc0e0867967db9e8905bc2d256
font_01_sfnt_off00010059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10059 11320 bytes
SHA-256: 47f26502afadee9480a99aab7ef3a5cdc3ad3ead08f9d85f88e2bb0d97963e7c