Malicious PDF — malware analysis report

Static analysis result for SHA-256 f678d1a5f1d7fc86…

MALICIOUS

PDF

85.5 KB Created: 2021-04-01 20:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b6081f794a186899697de7fc2bad2a9 SHA-1: 15da3e82637883d51fe3d47bd889aa2d8e5755fb SHA-256: f678d1a5f1d7fc86a027634b3dc273935fce13c510950a55dde3b6fa3447e5c4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to PDF files hosted on various platforms, suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, contains text related to 'Purpose of punishment sociology', likely a lure to attract victims to click on the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://jumiwimov.ru/strik?utm_term=purpose+of+punishment+sociology
    • https://zipalusub.weebly.com/uploads/1/3/4/3/134343211/jajenuvomug.pdf
    • https://static.s123-cdn-static.com/uploads/4417213/normal_5ff3a4a54d36d.pdf
    • https://static.s123-cdn-static.com/uploads/4415936/normal_6004119ddc5c6.pdf
    • https://cdn-cms.f-static.net/uploads/4367925/normal_600dd2a484883.pdf
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/kalemolikadi.pdf
    • https://borusolu.weebly.com/uploads/1/3/4/3/134327960/84086e6d5b2c2c.pdf
    • https://vevusivo.weebly.com/uploads/1/3/0/8/130874001/vebutuwo.pdf
    • https://vonuvevija.weebly.com/uploads/1/3/1/4/131407152/8884940.pdf
    • https://sodomolu.weebly.com/uploads/1/3/5/3/135398587/bizaterafi.pdf
    • https://xuxijirabof.weebly.com/uploads/1/3/1/4/131406659/kugelazodilafulimiji.pdf
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/nelegole-mozomabamalida-latalanikav-nijobibejunogof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d7d24770-b614-434f-87b3-392141a594fd/indian_coast_guard_assistant_commandant_medical_standards.pdf
    • https://uploads.strikinglycdn.com/files/9f42b08c-e998-4c58-b1bd-7903455aadf8/the_17_indisputable_laws_of_teamwork_embrace_them_and_empower_your_team.pdf
    • https://uploads.strikinglycdn.com/files/605978b4-54a4-4aca-a3ce-75cecb4dba3b/does_mendeley_work_with_office_365.pdf
    • https://uploads.strikinglycdn.com/files/0e489106-de21-4442-8299-aeda95f88476/nelson_pediatrics_audiobook.pdf
    • https://s3.amazonaws.com/gebukil/can_you_buy_phones_at_costco.pdf
    • https://s3.amazonaws.com/dinigugaxej/mudisaxuka.pdf
    • https://s3.amazonaws.com/feborobegibew/is_insecure_a_good_show.pdf
    • https://s3.amazonaws.com/fosawef/free_word_document_letterhead_templates.pdf
    • https://s3.amazonaws.com/wozoxub/south_africa_weather_report_map.pdf
    • https://s3.amazonaws.com/kizugokofo/litidulivazofevi.pdf
    • https://uploads.strikinglycdn.com/files/757bea92-dae6-42b8-aacd-b112ca6db975/pca_notes_on_aci_318-11_building_code.pdf
    • https://s3.amazonaws.com/dagasopones/49270009040.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_off00010f0e.bin
66cfad9359153a2fe5cdf5501c6af042a4196b47b7d8464ddaf9cc3439f9c0eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0E 5324 bytes
font_01_sfnt_off00012111.bin
29c17a8f3b56335f8fa8a7e7ba306e089855e13ed93398ea9966f0d8c32d2da7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12111 11900 bytes