Malicious PDF — malware analysis report

Static analysis result for SHA-256 b501f7647a7c0a12…

MALICIOUS

PDF

81.5 KB Created: 2021-03-09 18:34:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 70026577487dd17ec22e4841cd717b0f SHA-1: 9d5e7142d4e741641932281cee503822d0f45a31 SHA-256: b501f7647a7c0a12b689bd9b6486f62a59613d9dc68e102c86618c7b50a92b1c
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 0.9993

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/123?utm_term=diabetes+food+guidelines+2018 PDF link annotation
    • https://kunubixofatefif.weebly.com/uploads/1/3/4/0/134096788/95324002.pdfIn PDF document text
    • https://janejamav.weebly.com/uploads/1/3/4/8/134887015/900d7b0a98.pdfIn PDF document text
    • https://zizetorusiwewiw.weebly.com/uploads/1/3/5/9/135990502/1680870.pdfIn PDF document text
    • http://rutefozur.22web.org/ascensor_casero_manual.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/thank_you_mr._falker_by_patricia_polacco.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/manifiesto_comunista_marx_y_engels.pdfIn PDF document text
    • https://sepanafawo.weebly.com/uploads/1/3/4/3/134316973/siwemad_vinuratema_nobiweratafim_fenimipozikutof.pdfIn PDF document text
    • http://budozezofezuje.iblogger.org/lumurugafovabujoniwevon.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/zoo_york_digital_watch_manual.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/vuzatefeziwexaxisime.pdfIn PDF document text
    • http://janafan.scienceontheweb.net/budepedijad.pdfIn PDF document text
    • http://kewisanoxiv.66ghz.com/java_8_for_64_bit.pdfIn PDF document text
    • http://bopugafuwu.scienceontheweb.net/cooks_essential_pressure_cooker_recipes.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/rodivegixaxajomodewa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funawazepepu.rf.gd/mokabunefemafokezinili.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_d8cf1d3a4e914f64a5b8429f16dd676d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/duzerijugejiba.pdfIn PDF document text
    • http://tebuwawezizafes.onlinewebshop.net/stihl_blower_vacuum_bag.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/free_fillable_acord_forms_online.pdfIn PDF document text
    • http://fegelefuxenitud.rf.gd/fargo_airport_weather_report.pdfIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_1581b3ee13ae40e6816f611a7431b5b8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/piradi/sullair_185_compressor_troubleshooting.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_befff1d70c82421f81e1cc6d3ea8d347.pdf?index=trueIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_c9263865f606457f9394609f1d0230ad.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/regovadeje/reference_angle_worksheet.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_off0000ff99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF99 5636 bytes
SHA-256: afa88b80f3c30148f562805e5759fd3870708859ceca98c4efb47b33498f3334
font_01_sfnt_off000112e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E3 11132 bytes
SHA-256: 7a80523cd0fa3e9b2296ca2ed41bcaec66a95ebc80f39da320b085da1ced68b8