Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab63b8b73a05dc5b…

MALICIOUS

PDF

75.7 KB Created: 2021-03-10 18:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b46f473f8f3b50fdef1459c82eb3de0d SHA-1: 85ec350c6445e6af344cdedfe9fccc104ab77a63 SHA-256: ab63b8b73a05dc5b8bac690a8a5187abbbfaef12407b6626719dad1b7c741031
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many hosted on disposable domains, and a heuristic firing indicates it is a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading malware via a fake call-to-action. The document body is heavily obfuscated and does not provide clear instructions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/award?keyword=ielts+writing+task+1+model+answer+pdf PDF link annotation
    • http://biolinkus.me/forajamalexedoregunisepqyfy0.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/bubimiro.pdfIn PDF document text
    • http://igonlinesupport.com/where_can_i_get_rental_agreement_formw8w90.pdfIn PDF document text
    • http://tisimewifexumi.iblogger.org/12311687399.pdfIn PDF document text
    • http://xilatotes.sportsontheweb.net/law_clerk_course_in_canada_for_international_students.pdfIn PDF document text
    • http://parkingtest.xyz/wabuxevunuf85l08.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/32215436161.pdfIn PDF document text
    • http://jovefupe.mywebcommunity.org/lovore.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/17165413784.pdfIn PDF document text
    • http://item-mask.top/zeruxerovejured6wyis.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/what_role_does_school_play_in_socialization.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wagopof.epizy.com/what_is_the_best_short_term_stock_to_buy.pdfIn PDF document text
    • http://zipazakixodi.rf.gd/kikupekinovewuvetolakak.pdfIn PDF document text
    • http://simifibu.epizy.com/pedal_zoom_a2_preo.pdfIn PDF document text
    • http://gopudagob.epizy.com/paxafunawipijusukuxa.pdfIn PDF document text
    • http://navipulazem.epizy.com/the_game_season_4_episode_8_cast.pdfIn PDF document text
    • http://xijivegopu.rf.gd/how_much_does_a_navy_seal_get_paid_a_year.pdfIn PDF document text
    • http://gugefojekasarul.epizy.com/relve_bharti_2019_online_form_date.pdfIn PDF document text
    • http://zatunikepozis.epizy.com/karewef.pdfIn PDF document text
    • http://fidawakuxut.epizy.com/jufebafimilawupivorifunu.pdfIn PDF document text
    • http://naburonip.myartsonline.com/estrategias_de_comunicacin_con_personas_con_discapacidad_auditiva.pdfIn PDF document text
    • http://bojonovaja.rf.gd/mewamewibodezi.pdfIn PDF document text
    • http://guwitus.epizy.com/mizodu.pdfIn PDF document text
    • http://zitaporuzi.rf.gd/js_format_2_decimal_places.pdfIn PDF document text
    • http://dojagosixotebut.rf.gd/black_hawk_down_book_character_analysis.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_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 5508 bytes
SHA-256: f4ca44ff1333564d87e1d454d32e31963fde4c930c70a89820984b5380d01065
font_01_sfnt_off0000fc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8A 10960 bytes
SHA-256: 9cf94dec3c178a658e05dd186e1adb1c3a316c4d04993d75bd98153ab54c309b

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