Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ead8d66456756f3…

MALICIOUS

PDF

82.8 KB Created: 2021-03-13 22:13:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9555c4c4876cd4472e7378b271e3037e SHA-1: b5b9d154993271438b5a277be858840499e6c1b3 SHA-256: 9ead8d66456756f379c599718a61cc60aa5552fea9b8effac4e9817d368a91a5
134 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, including a link farm on disposable hosting, suggests an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to educational worksheets, indicating a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/award?keyword=solid+liquid+gas+worksheet+grade+2+pdf PDF link annotation
    • https://rudumareta.weebly.com/uploads/1/3/1/8/131871695/lugatizemepekekizer.pdfIn PDF document text
    • https://difidewuwigexej.weebly.com/uploads/1/3/4/6/134652805/adeaae56.pdfIn PDF document text
    • http://socialwave.me/zejurusezavamijetufuv5klqo.pdfIn PDF document text
    • http://ramerofebib.iblogger.org/what_does_standard_enthalpy_change_of_formation_mean.pdfIn PDF document text
    • http://emirofficialzm.com/67375840621rvxmd.pdfIn PDF document text
    • http://a1metromovers.com/341253284337ymdx.pdfIn PDF document text
    • http://slimerecipe.org/lunukodaturirafuwonezefenbq9be.pdfIn PDF document text
    • http://jobauthor.online/askep_alkalosis_respiratorikw6pe1.pdfIn PDF document text
    • http://1offpark.xyz/dekeboxasovitalezavuzr5ofr.pdfIn PDF document text
    • http://vuwagumewaga.iblogger.org/kafizesadujijebun.pdfIn PDF document text
    • https://cdn.sqhk.co/wedekimelol/Niejjhg/nezarevetuwipada.pdfIn PDF document text
    • http://mosdendy.store/sue_bryce6db5s.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/2952536.pdfIn PDF document text
    • https://zolowokixo.weebly.com/uploads/1/3/0/7/130738875/f04ccc.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabudoxuwa/gfgdggE/street_basketball_game_ps2.pdfIn PDF document text
    • https://kitabenulo.weebly.com/uploads/1/3/0/9/130969432/7080197.pdfIn PDF document text
    • https://cdn.sqhk.co/bupedamarib/h2jjM4y/download_princess_salon_cinderella.pdfIn PDF document text
    • http://indir-kazan.com/4314027826sb4fh.pdfIn PDF document text
    • http://ubzvp.com/ergobaby_360_vs_omni_reviewv5plo.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/YjcUujc/gosakigamometagusafudav.pdfIn PDF document text
    • http://de-bewertung-id-q2e5t23.top/sulijetae1eac.pdfIn PDF document text
    • http://varistop.site/how_often_do_kelly_services_employees_get_paidfbdz6.pdfIn PDF document text
    • http://xofazonir.iblogger.org/zamudosibovomuma.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://redebalumu.rf.gd/75312392793.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10462 5820 bytes
SHA-256: 83cf9b9557eb4b4f44fbcfdf7cdafa983e47e8b3b6a81898f8626cbfe2ee47ed
font_01_sfnt_off00011839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11839 10992 bytes
SHA-256: 6f155935713a6a4b9b2f29e5a32ceb1bb0173f29707d307ef3181d1e87bd59be

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