Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ca64a3fd017c49…

MALICIOUS

PDF

84.6 KB Created: 2021-04-04 22:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4ac913cac18bee9f44a9d3d7ce4b57d3 SHA-1: 9c5f601fc9bfee3adee759b730b3f2582a3cad95 SHA-256: b4ca64a3fd017c4999b4ffbaa3f5512838bdc6afaa54e85e7edf06d1874ffd29
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://bologen.ru/strik?utm_term=how+to+play+agricola+advanced+level PDF link annotation
    • https://cdn.sqhk.co/xekiparot/idheibJ/best_interview_answers_for_weaknesses.pdfIn PDF document text
    • http://zisapawiwako.mypressonline.com/accounting_and_finance_for_non_specialists_10th_edition_download.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/iiiaM1W/72899459563.pdfIn PDF document text
    • https://cdn.sqhk.co/lazemowul/jbgj0jf/retro_series_kettle_popcorn_maker.pdfIn PDF document text
    • http://lifeshop.pro/wizizowgya.pdfIn PDF document text
    • http://bufibinokurun.scienceontheweb.net/what_does_wisdom_teach_us.pdfIn PDF document text
    • http://birapemotafew.mygamesonline.org/belixizuvarisugitoti.pdfIn PDF document text
    • http://jumbochecker.com/asidosis_metabolik_pada_gagal_ginjal23stm.pdfIn PDF document text
    • https://cdn.sqhk.co/lovaxixifew/hhe4ifN/crash_of_cars_unblocked.pdfIn PDF document text
    • http://sodahub.club/137118941331v4mz.pdfIn PDF document text
    • https://legunumazonum.weebly.com/uploads/1/3/4/4/134455594/fuliwalibapaja-wivosevirob-rijuzuwovir.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/1bf4f64165abfaa.pdfIn PDF document text
    • https://cdn.sqhk.co/kakolutezegu/fwif2ne/how_are_dogcatchers_paid_worksheet_answer_key.pdfIn PDF document text
    • http://life50it.pro/bojenotebarivilapepufiwac9p9u.pdfIn PDF document text
    • http://zilitimo.getenjoyment.net/5_animal_kung_fu.pdfIn PDF document text
    • https://cdn.sqhk.co/zokosofu/fhgWijj/99922978172.pdfIn PDF document text
    • https://cdn.sqhk.co/dijogiper/hhdWZSb/20011418103.pdfIn PDF document text
    • https://cdn.sqhk.co/xenotami/bYhhjii/luzeramuribi.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/rLifRjh/24222877597.pdfIn PDF document text
    • http://storeeu.info/what_is_the_difference_between_ipilot_and_i_pilot_linkcu8zl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/dirt_bicycle_trails_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/cardioform_25mm_device.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/31451336581.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/compilers_principles_techniques_and_tools_solutions.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_off00010be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 5280 bytes
SHA-256: 8bd79f28b0a655b6c3bf48a7e595be4c2089733c81304092d5657c7ea53d1d17
font_01_sfnt_off00011e0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0C 10812 bytes
SHA-256: 88f46ac305d0628b61a163996978436b593385201ebd5b73e7d91c0f1d2498ac

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