Malicious PDF — malware analysis report

Static analysis result for SHA-256 35815c1fc3f54fbf…

MALICIOUS

PDF

83.1 KB Created: 2021-03-11 22:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 261763b7bea981c400db38ce8eedd3c3 SHA-1: c655a309cd7165b4447a492d838c6308a8732cb6 SHA-256: 35815c1fc3f54fbf153b88b65bb880f71571e7bd7ffc9fa9b9a6388685f91485
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF documents, many hosted on disposable domains. The primary purpose appears to be SEO manipulation or distributing further malicious content, as suggested by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://soxebez.ru/wix?keyword=maria+laguerta+and+ellen+wolf PDF link annotation
    • https://jobovivubip.weebly.com/uploads/1/3/5/3/135392816/7666125.pdfIn PDF document text
    • https://turamuko.weebly.com/uploads/1/3/4/4/134458704/tuvidesok.pdfIn PDF document text
    • https://bogewugarut.weebly.com/uploads/1/3/1/4/131483108/9347803dae7.pdfIn PDF document text
    • https://govodiroruje.weebly.com/uploads/1/3/0/7/130775462/baxakomojawik_wubosaxo.pdfIn PDF document text
    • https://vadanidubaseb.weebly.com/uploads/1/3/6/0/136089859/8065946.pdfIn PDF document text
    • https://tokopoxezi.weebly.com/uploads/1/3/4/6/134670235/5662c9e428eb.pdfIn PDF document text
    • https://zokutiwako.weebly.com/uploads/1/3/0/8/130873782/4611556.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_993a4a74dbe74c44b332048110e34144.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/995bf543-2683-437a-ac11-99ce312a4a53/what_was_one_of_the_main_features_of_the_congressional_reconstruction_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d9f1d4e-2a2b-4d3b-8392-47a2afa6e4d2/kupewatogorukogukiki.pdfIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_fc04a7691bfa4bd2848ce504f2c63bbe.pdf?index=trueIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_3c8a91986462445c906e226290e7c4c1.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_65f751a5d1ea490db93e59d14d0d7846.pdf?index=trueIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_e8b44c0c88b943849a410bcb67875cac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7c43cb5-a244-43d1-9a13-37b29f7076ac/strongs_concordance_4444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d0a8317-0e3e-448f-ad67-180d3839e5c3/ruger_lc9s_review_truth_about_guns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3725a6b-1d7c-4911-9241-882ef61ac028/how_to_enter_service_mode_samsung_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1b4d999-de3b-4251-bf43-22ef41dac301/word_2016_keyboard_shortcuts_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d2cc5ef-4975-4cd8-a032-62f58a112be6/buruzerabogajebilafawozes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1A 4992 bytes
SHA-256: d293f62b68d0dacca954fcebab43639725cc2c87d70082ed4eb45ba9a76fa03d
font_01_sfnt_off0001103c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103C 1608 bytes
SHA-256: 505785a6bd6859b1755384df6dfaba7fe9b1c211c39ea64bff23942fdd485763
font_02_sfnt_off00011859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11859 10928 bytes
SHA-256: 1cf1ed1b8ee25becfa472d9e3b9aebeb1981dadc0cc790442cd5fb3c53ef5291

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