Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b181d723e2bf3b…

MALICIOUS

PDF

78.5 KB Created: 2021-03-21 23:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e323e269c988987a2b9b78c0c0b01c15 SHA-1: 0e3d5aedbefc1a1238907539ac04ced8582c8c49 SHA-256: a1b181d723e2bf3b754ff151d9c875d0529661f2a107c47eccc394bb82865213
136 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of an external URI and an SEO redirector link, disguised as a study guide, strongly suggests a phishing attempt to lure users to a malicious website. No scripts were extracted, but the overall structure and heuristics point towards a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/wix?keyword=chapter+4+study+guide+biology PDF link annotation
    • http://vurovolapoza.mygamesonline.org/rulozotidojutisifinadi.pdfIn PDF document text
    • http://tujukesabegakom.mygamesonline.org/peer_gynt_suite_no._1_op._46_morning_mood.pdfIn PDF document text
    • http://abistrans.ru/3118387391083mdm.pdfIn PDF document text
    • http://subonus.ru/430002724452a0u6.pdfIn PDF document text
    • http://marketes.pro/technics_sl-d212_dust_coveriddvi.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/gjegiii/phone_ringtones_download_free_mp3.pdfIn PDF document text
    • http://salonhq.xyz/will_there_be_another_diary_of_an_awesome_friendly_kid0w9u2.pdfIn PDF document text
    • http://rusherx.studio/how_to_scan_multiple_pages_into_one_brother036f2.pdfIn PDF document text
    • https://cdn.sqhk.co/guvelebul/ijG3foe/20175541726.pdfIn PDF document text
    • http://indohealth365.online/87961181293loucm.pdfIn PDF document text
    • http://zaparipajomigi.scienceontheweb.net/calculus_of_a_single_variable_early_transcendental_functions_6th_edition.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/toliwudalamem/android_get_battery_cycle_count.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/89166433370.pdfIn PDF document text
    • https://s3.amazonaws.com/ninasivol/95222745287.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/chew_wga_0._9_windows_7_ultimate.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/juvamuruvanoziwedi.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/singer_simple_3223by_sewing_machine-berry.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/azbox_bravissimo_transformado_junho_2019.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_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 5456 bytes
SHA-256: 7e31c7ff4636da8bed54474592b455985df6a685bf44e90698ba32fe501ada46
font_01_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 11312 bytes
SHA-256: fae0bb0486f773ceaaf500abb744022b45458dad5760703d5bbd7123cdf6074b

Open this report in the interactive analyzer, or submit your own file for analysis.