Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20ed2a7992fa709…

MALICIOUS

PDF

122.1 KB Created: 2021-03-05 11:36:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 569519171ff7351e4a2846d71d58cb64 SHA-1: 8b0d1c1450a60efed5a22a3b16730c0c8aba0eed SHA-256: b20ed2a7992fa709cdb422d434d2d37a775e03dc432976ab58185578ba35630a
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 0.9995

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://botokaw.ru/123?utm_term=is+logic+a+math+class PDF link annotation
    • https://cdn.sqhk.co/mogowepuw/uEFt6id/nfl_scores_week_11_2019_schedule.pdfIn PDF document text
    • https://cdn.sqhk.co/duzemata/ROQhXf6/o2_international_sim_top_up.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/idkhhbC/social_emotional_intelligence_definition.pdfIn PDF document text
    • https://cdn.sqhk.co/nolovojawek/ji5d8jc/nadosimizobodi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_040eef6a9f604fafaf6aa4ff5bb52c8a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/gakidiseze.pdfIn PDF document text
    • https://e824aeac-d22a-4b45-bb3c-17051d6ee04f.filesusr.com/ugd/de60da_68ae3fea6d01490982a24f6e9f53e2d2.pdf?index=trueIn PDF document text
    • http://tijiwef.epizy.com/mindathedi_kuyile_video_song.pdfIn PDF document text
    • http://zikenonuto.epizy.com/canciones_infantiles_acordes_guitarra.pdfIn PDF document text
    • http://sowiveporumege.epizy.com/69206065865.pdfIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_cba059a99b24490d951caca9f8ec2cc3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinabisura/prc_online_application_form_for_criminology.pdfIn PDF document text
    • http://jatomadot.rf.gd/76385320430.pdfIn PDF document text
    • http://moliposapivar.epizy.com/53263713557.pdfIn PDF document text
    • https://eecb1da5-82b7-48ef-90e5-6a20895c07e7.filesusr.com/ugd/88a84f_20df3aff24ff4d0a835d1f8edc3833bd.pdf?index=trueIn PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_31f64964c8dc4b6990633045657c956e.pdf?index=trueIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_70748082781145deb58ab476b2dc9e9d.pdf?index=trueIn PDF document text
    • http://memokikadu.rf.gd/lamofizizulubis.pdfIn PDF document text
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_ed62fd73d1154f54816ffac91115564a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xojafemori/microsoft_powerpoint_product_roadmap_template.pdfIn PDF document text
    • http://kamabutexukawiv.rf.gd/bleacher_report_college_football_predictions_week_12.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000187a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187A1 5052 bytes
SHA-256: 159f70d3a618b8a3bed878ae02b767d16a71f4b4ff7827bde890a911ee2df682
font_01_sfnt_off000198b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198B2 13336 bytes
SHA-256: b2599b4bb8cd53492f89865cd24fb785923b144a5a77da1cf6748b0189092f92
font_02_sfnt_off0001c478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C478 16280 bytes
SHA-256: e6422a37b669c9ac6e44c60d55e399262fc99494c1ccc405979af00e8c2957c2