Malicious PDF — malware analysis report

Static analysis result for SHA-256 8858e967c946aaac…

MALICIOUS

PDF

84.0 KB Created: 2021-04-04 05:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7bf8219d031bbc611f27c5c39e009283 SHA-1: c7261328efdd94128590262bc2b66c3192dea6d2 SHA-256: 8858e967c946aaac20d4d4672b5f4736d7bb2c10151b2274af9ad84bdb956e48
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 0.9887

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://mezovuduw.ru/123?utm_term=blowfish+lola+platform+sandals PDF link annotation
    • https://murufirekitopu.weebly.com/uploads/1/3/1/8/131856476/2919477.pdfIn PDF document text
    • http://folugomobok.getenjoyment.net/what_caused_the_naturalization_act_of_1790.pdfIn PDF document text
    • https://wewivipumi.weebly.com/uploads/1/3/0/7/130775870/voganepitupuw.pdfIn PDF document text
    • https://lalazifesulalo.weebly.com/uploads/1/3/4/5/134502535/nowavukerez.pdfIn PDF document text
    • https://fuvexowigirupog.weebly.com/uploads/1/3/4/8/134896800/f717dd66c7.pdfIn PDF document text
    • https://xilivixawigilu.weebly.com/uploads/1/3/4/6/134672458/5423fc.pdfIn PDF document text
    • https://ximetekorexuven.weebly.com/uploads/1/3/4/4/134489871/zuzaripuzugabawis.pdfIn PDF document text
    • http://giwudogor.scienceontheweb.net/gaxalukovopeguzexajaf.pdfIn PDF document text
    • http://joritirumag.mypressonline.com/96574049273.pdfIn PDF document text
    • https://kikoxelila.weebly.com/uploads/1/3/4/3/134335894/83fb2.pdfIn PDF document text
    • http://belefekimixudul.22web.org/aiag_fmea_manual_5th_edition_free_download.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/sales_agreement_contract.pdfIn PDF document text
    • https://fidexirubopuzer.weebly.com/uploads/1/3/2/8/132815065/4602083.pdfIn PDF document text
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/nulawerezerukuxukutu.pdfIn PDF document text
    • http://xifutuvetowa.iblogger.org/autonomia_significado.pdfIn PDF document text
    • http://diporesorojina.scienceontheweb.net/56445633865.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://aa700e4b-9450-4a85-8b7e-8c92ffe47626.filesusr.com/ugd/de972d_c2d57ef3817843a79e3979ad25cb1559.pdf?index=trueIn PDF document text
    • https://e0d0d77b-4c00-4265-bc22-f0cc5cf11ada.filesusr.com/ugd/957eb4_e006e71843b04b579624f501397b8bff.pdf?index=trueIn PDF document text
    • http://samajusinifako.atwebpages.com/imno_nacional_mexicano_en_nahuatl_letra.pdfIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_4bc4773be46649c0b6270821cdb0163d.pdf?index=trueIn PDF document text
    • http://pefimubis.myartsonline.com/onkyo_remote_codes_for_samsung_tv.pdfIn PDF document text
    • http://ligoroxenafof.atwebpages.com/noxebakepedamaloninana.pdfIn PDF document text
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_7d797650816c4b5daf67bdb6cfd7fffb.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_8ccd3875b96b43f9ae52da540a04308c.pdf?index=trueIn PDF document text
    • http://zigufaza.epizy.com/99050443999.pdfIn PDF document text
    • http://lupixopuvir.onlinewebshop.net/how_to_make_a_jpeg_image_smaller_file_size_on_mac.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C4 5092 bytes
SHA-256: e8b6704aa5ee98b0c1f3d5da278a8040a3504ed1ef1c581390dbab0a8852654c
font_01_sfnt_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 11880 bytes
SHA-256: 351e99bc86f50351f669d7a8b44b4a021a3082972e2cb38d8f3b05694d5dd846
font_02_sfnt_off00011ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBE 16140 bytes
SHA-256: 2732c78df68b4531e26da51a256f0f9ab881cb8a96d1886ade34872d88eeece3
font_03_sfnt_off000133bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133BB 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176