Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb734c6de7f44dbd…

MALICIOUS

PDF

72.7 KB Created: 2021-05-17 08:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 24534b0c014becbe81a33a4f7074681a SHA-1: ad38e5695a2c7d22ccd406200343c12ab23bbeb2 SHA-256: bb734c6de7f44dbd6cff4d5ee50d9b8795d99c016b35632be30e23b506fda7c8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, mezovuduw.ru, which is likely used to host a malicious payload or redirect to a phishing page. The document body, though heavily obfuscated, suggests a lure related to search results or informational content.

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://mezovuduw.ru/strik?utm_term=how+to+attach+swiffer+wetjet+wood+pads PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368477/normal_6024eff481873.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/YicjgfN/zuduloliwugozoximitize.pdfIn PDF document text
    • http://idealicaitalia.website/manual_fiat_siena_hlx_1.8_2005xdi83.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426682/normal_5fc94a4321a43.pdfIn PDF document text
    • https://cdn.sqhk.co/gadowikuxe/i8xTjb4/14632164130.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490524/normal_600dfc3a3b321.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426422/normal_5ff1c9ea12247.pdfIn PDF document text
    • http://ttop-shop.com/how_to_wind_a_bobbin_kenmore_385y0ogk.pdfIn PDF document text
    • https://cdn.sqhk.co/vopofuxo/tgcHp7W/pegitogepogugav.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/idjiiad/color_of_the_night_movie_full.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc5170d1-660b-4371-909f-4203b74a5fa6/nisafozupuguwan.pdfIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_f4271966c3674608966b311c4615a672.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f1950c-4461-4c30-a835-799d6888f232/75049558591.pdfIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_8fcd70107aa34a7dbdc7fb0c0ce7d180.pdf?index=trueIn PDF document text
    • https://78fc25e8-d533-4ec3-a480-3617e8cc0d4b.filesusr.com/ugd/aa5866_80093e2ee5e447de94f4744bbdb734ca.pdf?index=trueIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_fadad68b6eff4f1fb71f644496f19a47.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e43fa50-0708-4afb-8984-fc66d6c06809/62959995471.pdfIn PDF document text
    • https://e5447efa-8854-4d04-834e-f0bbd7438c8b.filesusr.com/ugd/ac612b_528d890ede3d4e3ab941e37c4d60cf8b.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_off0000dbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBF 5340 bytes
SHA-256: 0ec443f78a28976f0940b5f437f08028a7468e05b6a86a23548c6703a1b80ae7
font_01_sfnt_off0000edfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFB 11640 bytes
SHA-256: 3e1f89ebf2426a119cef11ccf840027a383f4950cf327ee1b5dd09b60bd58a49

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