Malicious PDF — malware analysis report

Static analysis result for SHA-256 42ca1e3e36979edf…

MALICIOUS

PDF

78.8 KB Created: 2021-04-17 15:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2cfb88a16466d3d784cd2b16c352ce94 SHA-1: 540e06773d9cbd08085879d96bf821d24bfc8ab6 SHA-256: 42ca1e3e36979edfda85f5caced03d4f3a275bbf730cd8477ef5caf04a0ca832
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://mezovuduw.ru/strik?utm_term=pablo+neruda+love+poems+pdf+free+download PDF link annotation
    • http://vosojivaru.mypressonline.com/93479053206.pdfIn PDF document text
    • https://ronukeva.weebly.com/uploads/1/3/5/3/135385202/xuronesorame.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/english_phonetics_and_phonology_peter_roach_4th_edition.pdfIn PDF document text
    • https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/cd630f0317ccd7.pdfIn PDF document text
    • https://jukikekiku.weebly.com/uploads/1/3/1/4/131453151/bajesifaba-metawisafamom-mugafawuwux-fatibixex.pdfIn PDF document text
    • https://xajaxosu.weebly.com/uploads/1/3/5/3/135304217/perizir_gemori_linavefesinol.pdfIn PDF document text
    • http://mufosubofamar.mywebcommunity.org/physical_map_of_asia_with_rivers_mountains_and_deserts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_5116a46dd20040bb8920bc5f96e1d1f0.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_33400d2604f9404e8dbdae6457f99982.pdf?index=trueIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_a01d7d7aec6c49e78b8e9c1f1dd2b993.pdf?index=trueIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_fc49097c4c604786ae55ccdbc322e7a9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/06ec8da6-f9e1-444b-a503-58db20e9f5ea/bodas_de_sangre_resumen_corto_del_libro.pdfIn PDF document text
    • https://76c87692-cca9-4651-be8e-de6412dad411.filesusr.com/ugd/fdad67_22e14a4a3b194659a186dd6f59dff9b2.pdf?index=trueIn PDF document text
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_412dc228f8e64f4ba85ad6e24888010d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a423ed3c-3f8d-4244-abf0-bb5f04228253/38938842242.pdfIn PDF document text
    • https://7e62deb9-9b1a-4e2d-8b60-9a8f762ee201.filesusr.com/ugd/1f553f_aeb3da5514bd406287d3a30b2dafecbe.pdf?index=trueIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_067b9030a5b74224b163eef02f4b8373.pdf?index=trueIn PDF document text
    • https://204833c8-abda-4421-8777-5048ee7dd919.filesusr.com/ugd/e30b7a_2ad1236049524279a6346c9910b19039.pdf?index=trueIn PDF document text
    • https://14da0a27-f261-4d4b-8668-3a369f5c966d.filesusr.com/ugd/46429b_cfa52fd3ffac47deb68f84c9a81060c2.pdf?index=trueIn PDF document text
    • https://7f03322d-63d6-449b-a8c2-a80beffeb2b6.filesusr.com/ugd/2994dd_22b3c1610acc4d37900ad200033b9622.pdf?index=trueIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_6844f29550544692a588820695123194.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_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 5480 bytes
SHA-256: 1fec4cc69f67bbffad4954fa8305976676b0b1df1873eb7dcb212f48bd8ab6b2
font_01_sfnt_off00010555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 11368 bytes
SHA-256: 65094cb308a61475e3ed4389ef8320741bf1e592622ad30820e326df76be617d