Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1c203f0783820b…

MALICIOUS

PDF

65.7 KB Created: 2021-02-12 15:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a676a2e9f5ac8d6e26db7500cc6f13d SHA-1: 2690669e15d72d388744364fe450237016cb6698 SHA-256: 9f1c203f0783820b7468c267b8a2b3cdc84366b1a88b77463a8d24321478848f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=bill+nye+invertebrates+worksheet+pdf
    • http://jodopafipunew.22web.org/weekly_schedule_template_sunday_through_saturday.pdf
    • http://gifokojek.iblogger.org/zizimixoxabi.pdf
    • https://wuwiragirek.weebly.com/uploads/1/3/0/8/130874366/7454577.pdf
    • http://rigizaba.iblogger.org/5_star_chocolate_information.pdf
    • https://pagopejej.weebly.com/uploads/1/3/5/3/135315805/1575e4b9608501.pdf
    • http://lnstagramcopyrightservices.org/87463972797x7psv.pdf
    • https://nezivubu.weebly.com/uploads/1/3/1/3/131384481/zafutejibugipixaj.pdf
    • http://linogozajasupe.22web.org/oxford_dictionary_full_crack.pdf
    • https://norusukesalija.weebly.com/uploads/1/3/4/3/134356509/bc697.pdf
    • http://suwudera.22web.org/40788678295.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/nalifij/debuged.pdf
    • http://zimemotom.rf.gd/current_affairs_june_2019_affairs_cloud.pdf
    • https://s3.amazonaws.com/tedowafomaru/81901408271.pdf
    • https://s3.amazonaws.com/wunupalezozerud/reporting_factorial_anova_results_apa_style.pdf
    • https://s3.amazonaws.com/tawovojo/5421776985.pdf
    • http://waxozex.epizy.com/nts_dm_answer_key_15_september_2019.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_off0000b7ef.bin
044d7316aaa7290de9725459ffb8b00fedb50e30b9df05529c32c0e52bb09278
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EF 5424 bytes
font_01_sfnt_off0000ca65.bin
4e92a51490f1047343d27a0350d70899195eb79f5f4b4ed91a4efed9041b1186
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA65 9732 bytes
font_02_sfnt_off0000ebc3.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 4324 bytes