Malicious PDF — malware analysis report

Static analysis result for SHA-256 833af734ac1cc80d…

MALICIOUS

PDF

79.6 KB Created: 2021-03-23 22:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fe94f4baef52cad94c15c463c9463ac4 SHA-1: efae119c3fa749b9c21a220807ffc0b275568ae1 SHA-256: 833af734ac1cc80db8aecf6087dc6feba38c0b4583ba8d4852cc04715c10e2e1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to suspicious domains, indicating a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically a phishing or trojan payload. The embedded URLs are likely used to redirect the user to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://bologen.ru/strik?utm_term=how+to+do+positive+self+talk+in+sport PDF link annotation
    • https://fikazimibugexu.weebly.com/uploads/1/3/4/5/134515259/2920411.pdfIn PDF document text
    • http://kinokaiff.space/lupuxote0s915.pdfIn PDF document text
    • https://varowuzogan.weebly.com/uploads/1/3/1/8/131856285/23df83301d554fb.pdfIn PDF document text
    • https://tagakokiginozol.weebly.com/uploads/1/3/0/7/130775172/lojemaw.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/24877811094kalfh.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/jaHiihf/wolf_appliance_service_seattle.pdfIn PDF document text
    • https://wuxelulomevadi.weebly.com/uploads/1/3/4/9/134904547/1597473.pdfIn PDF document text
    • https://kulaxebide.weebly.com/uploads/1/3/2/3/132302774/9a813a050.pdfIn PDF document text
    • https://cdn.sqhk.co/wowixepis/iNQ3scx/occidental_heroes_character_guide.pdfIn PDF document text
    • http://mon-cmb.best/glock_26_gen_4_trigger_pull_weight6il8u.pdfIn PDF document text
    • http://fastnoutservice.ru/80752199323b12ru.pdfIn PDF document text
    • https://cdn.sqhk.co/boketumejipa/jhR9Cjd/22544933327.pdfIn PDF document text
    • http://nunovoxiwanafuz.getenjoyment.net/84302478089.pdfIn PDF document text
    • http://fb-ig-copyright.com/roku_stick_remote_for_saletdimb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zakunafu/los_diarios_de_motocicleta.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/simile_and_metaphor_worksheets_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/61000607229.pdfIn PDF document text
    • http://xakagigoneliv.myartsonline.com/what_is_the_magnitude_of_gravitational_force_between_the_earth_and_a_1_kg.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/23321328473.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/korean_chaebol_reform.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_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 5212 bytes
SHA-256: 529771cacb2be988c4c1d7988c9e84d927fca553a5c5f9793e2228e2c76078c3
font_01_sfnt_off00010ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 11244 bytes
SHA-256: f258b01ad74a2d76346a07c0b686712afc4132ead28965744a8c4e3bca8f4fab

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