Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba157a62e6fb33d4…

MALICIOUS

PDF

83.8 KB Created: 2021-04-06 18:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 12b538fe933f41d551081151af2e6fd6 SHA-1: 9b0f8e9fcc7a5c522457834067864e88f55a17e2 SHA-256: ba157a62e6fb33d41e508aa9e9014a879b1749d28c56ae8501566e95dc5d046a
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to academic decathlon quizlets and wkhtmltopdf, likely as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://zajinet.ru/wix?keyword=academic+decathlon+2020+quizlet PDF link annotation
    • http://baugroup.info/power_cooker_xl_beans_recipeji9yd.pdfIn PDF document text
    • http://onesmall.space/jovolikod8hm.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/jhinAhh/66481671585.pdfIn PDF document text
    • https://cdn.sqhk.co/rogolafu/9Jthd8T/bitdefender_total_security_2019_software.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/h5xSyjd/dizazasawozomij.pdfIn PDF document text
    • http://bezugunafagomup.22web.org/lagofuvisibusesu.pdfIn PDF document text
    • http://mybestchan.online/perfect_modal_verbs_exercises_with_answers9hzxe.pdfIn PDF document text
    • https://cdn.sqhk.co/zutijujes/geChaHu/trail_climb_mod_apk_android_1.pdfIn PDF document text
    • http://lightstart.xyz/35404480947ciex5.pdfIn PDF document text
    • http://blockhcain.host/netis_wireless_n_range_extender_setupaka72.pdfIn PDF document text
    • http://damvglaz0.xyz/gisipojiruwuzepeduvi3jkf4.pdfIn PDF document text
    • http://rfs.team/vadoxavmdya.pdfIn PDF document text
    • https://cdn.sqhk.co/reposivekow/fwnjihf/blackberry_curve_9380_android.pdfIn PDF document text
    • http://donbetosstreettacos.com/how_to_pair_a_skullcandy_speakery3ssd.pdfIn PDF document text
    • http://funseeds.site/desktop_wallpaper_hd_widescreen_freekz5fu.pdfIn PDF document text
    • http://mon-cmbretagne.best/16689144366labie.pdfIn PDF document text
    • http://5coupon.info/kogonolotanabivuwojojoquaes.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvazilu/cgjbAjg/724547537.pdfIn PDF document text
    • http://palitra-cveta.ru/amadas_peanut_combine_parts_manualgufod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wedutatitupaze.epizy.com/bahara_song_free_320kbps_pagalworld._com.pdfIn PDF document text
    • http://fodusazal.rf.gd/estampie_royal_violin_sheet_music.pdfIn PDF document text
    • http://vomogowejupilu.rf.gd/88653169260.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF231 5344 bytes
SHA-256: 303b8132aa8f0e6cac01ec442ef5f07e6df0439156b1b2fd8f0e8d23ac09b5a0
font_01_sfnt_off0001043f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 11752 bytes
SHA-256: 37d66f1611862a769e341a98ded605367409671479b944adaabff0cd45dc2f71
font_02_sfnt_off00012c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7C 16148 bytes
SHA-256: ba357f43bc54157f12a2ca2187aa39354a6313f623368f7d2231b784e4c5b532

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