Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f25132d17e2c938…

MALICIOUS

PDF

76.7 KB Created: 2021-04-07 16:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e10104fea470073d73985a03cdb29e50 SHA-1: e3aaecf490ee8f6fcd123a28f9cb2416ef3e20b4 SHA-256: 8f25132d17e2c938a6a32aeba70b9f14cc4eaa2a5fb1dc9ebff69624fab0acd0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to disguise malicious content within a large number of links. The primary IOC is the URL https://druttle.ru/wix?keyword=vocabulary+workshop+level+g+unit+10+completing+the+sentence+answers, which appears to be a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wix?keyword=vocabulary+workshop+level+g+unit+10+completing+the+sentence+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365600/normal_603207ffabb22.pdfIn PDF document text
    • https://bupafenanibud.weebly.com/uploads/1/3/4/0/134042845/gitowajutojixuzev.pdfIn PDF document text
    • http://woodbonus.net/97870056171cbtdv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367310/normal_60206100a2488.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454167/normal_600380e2a95a7.pdfIn PDF document text
    • https://dezusopivelisuk.weebly.com/uploads/1/3/4/7/134734284/kidesevosuxabo-vafopasavofe.pdfIn PDF document text
    • http://cherrypimp.online/power_electronics_engineer_salary_in_mumbaijcsnq.pdfIn PDF document text
    • https://jixeneneme.weebly.com/uploads/1/3/4/0/134096386/448ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409093/normal_6062f201d39ad.pdfIn PDF document text
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/9052756.pdfIn PDF document text
    • http://stroiline74.ru/9750927936g2zp8.pdfIn PDF document text
    • http://gufutaca5.xyz/328149060638hfzk.pdfIn PDF document text
    • http://triple-doska3.club/english_speaking_daily_usejuw8l.pdfIn PDF document text
    • http://copyrightreports.com/is_it_worth_repairing_a_transmissionq3auw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404293/normal_5ffcd3a16d946.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_138c2a5bd4f445718e327be8f1691918.pdf?index=trueIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_101117cbbe7749f89345da7727b99376.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab1f0a33-b856-4406-acaa-ece7368e6e21/nujek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/725d8dfd-9061-448f-b535-6ba59e40191e/32675761532.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70681b10-ba3d-4f97-9e22-e866299fbb02/57557610029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcddbc5e-9b83-4dbb-b79c-52e9e85bf735/gesadeporojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a925f43a-a41d-412f-ac5f-7aad298a22d9/monitor_acer_al2216w_driver.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_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 5964 bytes
SHA-256: 2461b427edd8600a5ef834eb2d165a07b42abc051a947d8d51061a5dc0d5ce12
font_01_sfnt_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 10164 bytes
SHA-256: 080d1d4f0b5397673dd98df15ad4d2df7f8b16af45684190aed3341116826318

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