Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d149b9737c02f79…

MALICIOUS

PDF

76.0 KB Created: 2021-04-06 22:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 29025548c3d6839107211e030e32d9bb SHA-1: 783c02146231bf0c15016f883cb7e37246f3e7cd SHA-256: 4d149b9737c02f79bdad19a994d11be9853426d715ddb5676ac148f2e1f50cdb
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, and one specifically uses a 'strik' endpoint, suggesting a phishing or malware delivery attempt. The document body, though heavily obfuscated, contains text related to educational materials, likely serving as a lure.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/strik?utm_term=cgp+gcse+physics+workbook+answers+edexcel+pdf PDF link annotation
    • http://biwedujurar.mywebcommunity.org/effects_of_soil_pollution_on_plants.pdfIn PDF document text
    • http://bowoporoj.iblogger.org/hochtief_annual_report.pdfIn PDF document text
    • https://cdn.sqhk.co/feluxolid/xGKPHhf/kung_fu_tea_set_travel.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/wojijefarolotugufor.pdfIn PDF document text
    • http://gejejasofubi.mywebcommunity.org/gajovo.pdfIn PDF document text
    • https://cdn.sqhk.co/xisapabo/jgeiajf/age_of_z_origins_level_16.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/what_is_the_verse_train_up_a_child.pdfIn PDF document text
    • https://cdn.sqhk.co/noloxunipe/ihjIwcC/ralph_s_famous_italian_ice_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/i3nsPia/jigujovudupideratuduv.pdfIn PDF document text
    • http://vujilob.22web.org/the_art_of_botanical_drawing.pdfIn PDF document text
    • https://cdn.sqhk.co/toxodimina/jepjghj/71572149466.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a1104102-e7f7-498f-9db5-fd16eb5a1c84.filesusr.com/ugd/3f19aa_c0b4d3e622e345219a5c547c306fd6bf.pdf?index=trueIn PDF document text
    • http://wigezenefibi.epizy.com/grafham_water_fly_fishing_report.pdfIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_81caf719734a475aa7a998303257cce6.pdf?index=trueIn PDF document text
    • http://jefevuxivux.epizy.com/adina_sika_free.pdfIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_691c73de63a34e438fc4be42aecf8f70.pdf?index=trueIn PDF document text
    • http://zawemitop.epizy.com/dajerakabewo.pdfIn PDF document text
    • https://e8b83640-91e4-44a0-a69f-c2468797902f.filesusr.com/ugd/ee4a13_55d383ff1e5749b698ef1d8e448e6d4c.pdf?index=trueIn PDF document text
    • http://wovitoted.epizy.com/7704909937.pdfIn PDF document text
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_c9eb7403ed2747519e0c01a277f295d1.pdf?index=trueIn 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_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 5788 bytes
SHA-256: c8622f4faa799ffda15631128544aa950f496af60498bd7bf19bc81ebc70b4b5
font_01_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 11556 bytes
SHA-256: e46ae7e0f3c007fa68817c55e162da3c628454b2e7b5bb2ed1817ebbc81b3966

Open this report in the interactive analyzer, or submit your own file for analysis.