Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf88a772c18ed47…

MALICIOUS

PDF

79.4 KB Created: 2021-03-15 15:26:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf91218c78078d88ec279d80ece542d8 SHA-1: b93ef874c044bc988033ac12ca39953d74c7784a SHA-256: faf88a772c18ed47b56a5b6153bfdb73f24f42121391710cc4304b49921c4bd7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The PDF contains a large number of external links, suggesting it is part of a link farm or SEO manipulation scheme to drive traffic to malicious sites. While no scripts were explicitly extracted, the presence of numerous external links and the PDF structure strongly suggest an attempt to exploit vulnerabilities or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=worksheet+photosynthesis+%2526+cell+energy+biology+answer+key
    • http://gadatoreneperil.mygamesonline.org/can_i_use_google_maps_on_my_apple_watch.pdf
    • http://tulusujubige.mygamesonline.org/95313207117.pdf
    • https://kuvitarige.weebly.com/uploads/1/3/4/0/134095916/9900986.pdf
    • http://deladinabixek.sportsontheweb.net/bhavani_ashtakam_in_tamil.pdf
    • https://lakofanagobogan.weebly.com/uploads/1/3/5/3/135386994/5ebaec80.pdf
    • http://zobotalemogi.sportsontheweb.net/xakapuropivomalelev.pdf
    • http://gakagebir.mypressonline.com/reliability_data_analysis_with_excel_and_minitab_download.pdf
    • https://divuvefa.weebly.com/uploads/1/3/4/7/134759037/91055.pdf
    • http://tosefabebiribow.scienceontheweb.net/sony_cdp-cx355_belt_replacement.pdf
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/xulatifuxi.pdf
    • http://xijulefabogi.getenjoyment.net/kurotewezifuvedafad.pdf
    • http://leporabev.mywebcommunity.org/schema_analisi_periodo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/37ad1e40-b725-4d68-ba67-c19e0542918d/pokemon_sun_and_moon_starters.pdf
    • https://uploads.strikinglycdn.com/files/c5f40cf8-37f3-4d59-92b9-4c7baa056dd7/microsoft_flight_simulator_2020_release_xbox_one.pdf
    • http://gixejemazob.myartsonline.com/electrocardiograma_libros.pdf
    • https://uploads.strikinglycdn.com/files/4f45a91d-da7f-4d9d-b264-de5adf48d77d/72945887525.pdf
    • https://uploads.strikinglycdn.com/files/49323dbc-696c-4fc9-975a-90f8be739e2f/what_are_smart_iep_goals.pdf
    • https://uploads.strikinglycdn.com/files/6cf40ad4-7ebe-41ac-8e41-42170ceb8402/datamax_i_4208_top_of_form_fault.pdf
    • https://uploads.strikinglycdn.com/files/341d2442-cd54-4765-9111-212763dafef6/23059491464.pdf
    • https://uploads.strikinglycdn.com/files/e3455cff-75fc-43f9-aa6c-7705b1bd4400/biology_workbook_9th_grade.pdf
    • https://uploads.strikinglycdn.com/files/c944da5a-169d-4da2-b056-87c82e73a032/love_story_song_dj_remix_2020_download.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f966.bin
e55541ae97a87fdf3f415c7cbe85ceffd37eeef1d30fafe3823a69c01f815526		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 4844 bytes
font_01_sfnt_off000109f2.bin
29e1ae186066acfcc2bc2a5dffdb66a2843f9d13bb2dedd4219930f22428333b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 10628 bytes

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