Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3cb1aa3eae0385…

MALICIOUS

PDF

73.9 KB Created: 2021-01-26 09:39:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4ee2122c892f6be4d9132be6dc7a24b9 SHA-1: c578860e21cbff4750dc86eb5de162f27698d2b7 SHA-256: 6b3cb1aa3eae038520afc2442428119e65628be78a15fa8e85bf0298427634f3
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan attempt. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and 'Qt', and the presence of external URIs and a link farm heuristic strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/123?utm_term=masters+of+mankind+essays+and+lectures PDF link annotation
    • http://bilapak.66ghz.com/jugawanogizugedufivujoxok.pdfIn PDF document text
    • https://bulipegorevuju.weebly.com/uploads/1/3/4/7/134700868/6763711.pdfIn PDF document text
    • http://telemprom.xyz/togafupafulenukenipawkhhe2.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/pirekuvedilopife.pdfIn PDF document text
    • http://rkconstructionsucks.com/teachers_union_florida_newsgralz.pdfIn PDF document text
    • https://wipasajumavadus.weebly.com/uploads/1/3/4/7/134775966/kikabiwuta.pdfIn PDF document text
    • https://zofifonanofanap.weebly.com/uploads/1/3/4/8/134876640/musovikodexefuxa.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/how_to_get_10k_followers_on_instagram_2019ywkub.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/16ed95d8.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/WQgjqEG/8882595232.pdfIn PDF document text
    • http://brettlockhart.com/9091292033oh81p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lalejifidesuwo.rf.gd/3d_hd_wallpapers_1080p_for_android_mobile.pdfIn PDF document text
    • http://xupudajiwozov.epizy.com/accessions_medical_history_report.pdfIn PDF document text
    • http://bupozefi.epizy.com/medical_report_sample_doc.pdfIn PDF document text
    • http://buwepuxaj.epizy.com/jaxoratususiminafozol.pdfIn PDF document text
    • http://vaduxovogemuke.epizy.com/soxos.pdfIn PDF document text
    • http://belukamafanes.rf.gd/analog_and_digital_communication_book_free.pdfIn PDF document text
    • http://vuvuvemalazot.epizy.com/colosseum_rome_tourist_information.pdfIn PDF document text
    • http://zawuzujuw.epizy.com/dauntless_chain_blades_guide.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_off0000e4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EE 5340 bytes
SHA-256: 0ad35ad52d1e7e57518b2dc211dc0c3c492978dead03e8bba105bbf4ee151b05
font_01_sfnt_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 10300 bytes
SHA-256: 166b80c090511dd494200c6793a263620d24ae6cd0c4e37fffba9bd4f79cc34c

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