Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bad34c4e9d576bf…

MALICIOUS

PDF

79.3 KB Created: 2021-03-12 13:25:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: f9f7db11a5389285fbb5147fe3e10ecb SHA-1: 99f6f142683e19a31e355a663adea5a001946e0e SHA-256: 4bad34c4e9d576bf97a520903b6cf052c1138a4be53fc9fb1a0fe10e58c9d118
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'English in asl sign' and metadata from wkhtmltopdf, suggesting a lure document designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/wix?keyword=english+in+asl+sign PDF link annotation
    • https://dumosube.weebly.com/uploads/1/3/1/1/131163669/mekikufagomezin.pdfIn PDF document text
    • http://brettlockhart.com/318503201dvpnh.pdfIn PDF document text
    • https://fijoxivivuf.weebly.com/uploads/1/3/4/0/134041864/149382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371014/normal_603f95b310975.pdfIn PDF document text
    • http://dkmz1.club/jazadejelu7dogv.pdfIn PDF document text
    • http://qupieasy.online/barcarolle_sheet_music_freej1goh.pdfIn PDF document text
    • http://sell-toclick.online/how_much_is_a_real_christmas_tree_at_lowes7kapd.pdfIn PDF document text
    • https://pafebexazare.weebly.com/uploads/1/3/1/1/131163914/5482827.pdfIn PDF document text
    • http://onlinetyz.xyz/5651425215imb60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485308/normal_6026bde7a8583.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413563/normal_5ff617b3f04b2.pdfIn PDF document text
    • http://kernig.pro/map_skills_nwea_student_loginx78lp.pdfIn PDF document text
    • https://gebikatewizej.weebly.com/uploads/1/3/4/3/134311033/sapinuruja-lolekufalov-xajuwutefemi-merixagukux.pdfIn PDF document text
    • https://tigobatimomovo.weebly.com/uploads/1/3/2/7/132740361/668d557386d1b.pdfIn PDF document text
    • http://brumbum6.xyz/99224008005kwi7f.pdfIn PDF document text
    • http://smilex.club/favopasuzevanewuwuncf8fq.pdfIn PDF document text
    • https://zojubexetiw.weebly.com/uploads/1/3/5/3/135316795/pidovewizepovawupiga.pdfIn PDF document text
    • http://raisinshub.pro/mcent_browser_old_apk_apkpure4ies9.pdfIn PDF document text
    • https://bapadiwifujeki.weebly.com/uploads/1/3/4/0/134041393/vuladajovuxiwax-rajavoxe-piluzevagozo-xojizezo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bezopiwuzalobit.rf.gd/palayathu_amman_remix_songs.pdfIn PDF document text
    • http://ferurexage.epizy.com/61693446118.pdfIn PDF document text
    • http://vunatavinede.epizy.com/5_times_table_worksheet.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_off0000fb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB31 4808 bytes
SHA-256: 32b365badc1f4834fc4566e9f03e436f2149cdf1959a5947731a55b17bee7672
font_01_sfnt_off00010b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B92 10596 bytes
SHA-256: 29a3659222d63e40d733d197ed49eefb2536e56ef06ccc0620b1a1b95c02be3d

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