Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd0bb601327de5d4…

MALICIOUS

PDF

78.3 KB Created: 2021-04-29 12:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b9b6eb4e11aae7e0687291eaa143f3d8 SHA-1: 955a0bedcc1eea396b113305ceb44354139e9859 SHA-256: dd0bb601327de5d4d80dda50497d118982ad4e6032098085613ee25b04309f8c
126 Risk Score

Malware Insights

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

The PDF was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, with one pointing to 'jacksth.ru', suggesting an attempt to redirect users to a malicious site. The PDF's structure as a link farm on disposable hosting further supports a malicious intent, likely for distributing further payloads or conducting phishing.

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=how+do+hyperbaric+oxygen+chambers+work PDF link annotation
    • https://juzopuxenepin.weebly.com/uploads/1/3/5/3/135383483/1770191.pdfIn PDF document text
    • http://vojituvidur.iblogger.org/kupizetalu.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/422670.pdfIn PDF document text
    • http://pulalazikirepu.iblogger.org/pengertian_metode_bercerita_menurut_para_ahli.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/97d4b236-d0d9-4879-bbbd-7c6b8a0765c8/57281927364.pdfIn PDF document text
    • http://gowatane.rf.gd/novel_cecillia_wang.pdfIn PDF document text
    • http://besubavivexuva.epizy.com/what_are_the_uses_of_transition_metals.pdfIn PDF document text
    • http://rozazidugo.epizy.com/86749716892.pdfIn PDF document text
    • http://zepibugab.rf.gd/astm_a193_grade_b8.pdfIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_9cd45797a82f44d5baaeb9cf43810be7.pdf?index=trueIn PDF document text
    • https://5e024257-ca51-40df-b6b5-a3104c7b7124.filesusr.com/ugd/97368a_676a45106f394ca4bdc9a196953b2a37.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95c36a1-f36f-42d8-bc04-d6a08a394dca/kugitanunulaxudi.pdfIn PDF document text
    • http://rajowezurub.rf.gd/rpm_calculation_formula.pdfIn PDF document text
    • http://popirarubinuluk.rf.gd/bus_map_florence.pdfIn PDF document text
    • http://nuwumunis.epizy.com/40808266864.pdfIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_8d2e41b4038a44bc8e3230ed03b723a4.pdf?index=trueIn PDF document text
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_7de00bbb1cfb4ff98a1ece42269061ba.pdf?index=trueIn PDF document text
    • http://vosivoru.epizy.com/luzematereluzowof.pdfIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_4bdf3ef2df5942e7a1f8c51421c2bba3.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_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 5884 bytes
SHA-256: 68f652aa8113bab5a0971b814e5b86974d4ce7fcd357762bc29959d1a2daa895
font_01_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 11108 bytes
SHA-256: b955b9a90effc9488ff6b744c8419b36e95a6bc5fcf9a6ccc4e17c0b5c8bd596

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