Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9dc50220fb419b…

MALICIOUS

PDF

115.8 KB Created: 2021-03-15 12:12:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c4c986ea0bde7591cdfa8d7a907772e2 SHA-1: 21156c9f620c95d92feb0cf5e96a7aa98fc4c40f SHA-256: aa9dc50220fb419be8228ac8fb53ec78641e17085bd1d427196da36feaee5a19
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and identified as a link farm, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely leveraging JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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 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://golowaki.ru/wix?keyword=language+handbook+worksheets+answer+key+grade+12 PDF link annotation
    • http://lastmarkt.ru/favo_de_mel_goiania6c4pn.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/schwinn_bike_trailer_costco.pdfIn PDF document text
    • http://idealicacolumbia.site/vunonewgygh.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/what_are_the_40_rules_of_love.pdfIn PDF document text
    • http://jirenaxapibetig.scienceontheweb.net/agendas_alternatives_and_public_policies_espaol.pdfIn PDF document text
    • http://swiss-gear.shop/96809811017rv7pe.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/7hdKjiz/26392616483.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/acurite_digital_thermometer_with_10-foot_temperature_sensor_probe_and_humidity.pdfIn PDF document text
    • https://cdn.sqhk.co/bukevexej/ifChgie/lansweeper_report_not_like.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/ghoQgcL/zokawunuvulileteno.pdfIn PDF document text
    • http://usene.xyz/luruxonomilr6yy2.pdfIn PDF document text
    • http://rumepado.mypressonline.com/timarisavesa.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/IKiaid9/duzazoxigun.pdfIn PDF document text
    • http://rivilidopu.medianewsonline.com/beatles_songbook_chords.pdfIn PDF document text
    • http://bulufapisaf.iblogger.org/begomototinoj.pdfIn PDF document text
    • http://opendouche.xyz/73829807358aiipb.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
    • http://xawaduvuxulamef.epizy.com/what_is_the_difference_between_oral_b_1000_and_1500.pdfIn PDF document text
    • http://gototura.myartsonline.com/pogil_work_power_and_kinetic_energy_worksheet_answer_key.pdfIn PDF document text
    • http://suxudogakol.myartsonline.com/what_are_statistical_inferences.pdfIn PDF document text
    • http://vidilig.onlinewebshop.net/addition_and_subtraction_rules.pdfIn PDF document text
    • http://serinuzosazojup.epizy.com/valores_humanos_descargar.pdfIn PDF document text
    • http://vetanafajodomek.epizy.com/nefigemizixagorix.pdfIn PDF document text
    • http://viwesusogura.rf.gd/everything_that_remains.pdfIn PDF document text
    • http://gizixaxeviduf.myartsonline.com/45175969559.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_off00017c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C5F 5412 bytes
SHA-256: dab4c1e87d5279b6787103bce6c2c02b4e3af64bb4d32d6bad493be548c9b36c
font_01_sfnt_off00018ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ECD 10896 bytes
SHA-256: a06bdfad89aee5293c24a3c981b26e2e2cdd37e43972e767dab2d9882258ffba
font_02_sfnt_off0001b32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B32E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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