Malicious PDF — malware analysis report

Static analysis result for SHA-256 4543d51a4b3f1071…

MALICIOUS

PDF

72.0 KB Created: 2021-02-24 11:14:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 5dc74f976ac3c15c6e00af272c96d226 SHA-1: 0c6a2a63e0cf50a0273536aeb69ff138f2b38115 SHA-256: 4543d51a4b3f1071b7a03274a21a67d4e7a7a67de9a52daed320370e4fee9a5d
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=algebra+1+dimensional+analysis+worksheet+with+answers+pdf PDF link annotation
    • https://tedawubav.weebly.com/uploads/1/3/4/3/134376018/5214484.pdfIn PDF document text
    • https://gazotudigexeb.weebly.com/uploads/1/3/1/1/131164446/2491249.pdfIn PDF document text
    • http://zumofujej.iblogger.org/vista_32fb_installation_and_setup_guide.pdfIn PDF document text
    • https://pupizotewijuguw.weebly.com/uploads/1/3/0/7/130775862/9330099.pdfIn PDF document text
    • https://fawewetipe.weebly.com/uploads/1/3/1/3/131379545/7168674.pdfIn PDF document text
    • https://wodorolijuzawex.weebly.com/uploads/1/3/4/7/134770742/wumig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://davutawopoban.epizy.com/viguja.pdfIn PDF document text
    • http://deravamosu.rf.gd/free_android_mobile_spy.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/29813332571.pdfIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/rimagigosave.pdfIn PDF document text
    • http://buwanizun.epizy.com/how_does_color_code_drug_testing_work.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/aashiqui_2_background_music_piano.pdfIn PDF document text
    • http://fudixuxutinizow.rf.gd/seminar_report_on_basalt_rock_fibre.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/password_protect_file_adobe_reader_xi.pdfIn PDF document text
    • http://raxulifuroroga.epizy.com/viper_remote_start_instructions.pdfIn PDF document text
    • http://jidoreno.epizy.com/algebra_worksheets_solving_two_step_equations.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/kilima.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/vivaldi_summer_cello_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/sefamojotusapepuluzimumak.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/1628783490.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/kimepekogiweno.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_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 5892 bytes
SHA-256: a90734c17fa26223f6a3b49a96c58415829619e044e88ca40fb06e4a1f521fd4
font_01_sfnt_off0000ee8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8A 10416 bytes
SHA-256: e0b62989225e281f4609fa902c1cd12c19e677196244e91ec9c775ee3a66a0e1

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