Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b62de348c1b5d5…

MALICIOUS

PDF

76.2 KB Created: 2021-03-09 10:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd953a890ac31e122022a43f05935950 SHA-1: e10ea9936adf2bb6b11dbc649e974b96b45e8fc6 SHA-256: 33b62de348c1b5d560a4ac5bfe2c8624fdf580cf7eaa4a816cd1b907e3144c53
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and Epizy hosted PDFs, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detections strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=federalist+and+anti+federalist+writings+worksheet
    • https://gevamimukeruku.weebly.com/uploads/1/3/4/6/134656740/61db99.pdf
    • https://laxedojopepab.weebly.com/uploads/1/3/4/8/134896069/menabodalev-vapurojomot-gosatu.pdf
    • https://fuxiwajusefu.weebly.com/uploads/1/3/4/6/134617271/siwulajax.pdf
    • https://judozolu.weebly.com/uploads/1/3/1/4/131407514/7482672.pdf
    • https://cdn-cms.f-static.net/uploads/4377113/normal_603829daa39ee.pdf
    • https://static.s123-cdn-static.com/uploads/4420917/normal_60047d09444cc.pdf
    • https://xoburorabusu.weebly.com/uploads/1/3/0/7/130738623/802340b.pdf
    • https://nojabepeteguki.weebly.com/uploads/1/3/4/6/134669956/1429552.pdf
    • http://tidemelewofu.iblogger.org/beethoven_bagatelles_op_119_sheet_music.pdf
    • https://dudunubute.weebly.com/uploads/1/3/4/1/134132035/bizonujodo.pdf
    • http://noncomform.space/sadiramekiz5uvi1.pdf
    • http://merovew.xyz/987388962533u959.pdf
    • http://legiontry.online/suromanez93g5e.pdf
    • http://xogubafirugufa.iblogger.org/first_90_days_summary_template.pdf
    • https://gosopitodemeku.weebly.com/uploads/1/3/4/8/134874694/wazapavuborapalej.pdf
    • https://kadamoxezegawuf.weebly.com/uploads/1/3/4/3/134347408/bce84f262f50.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nisiwanolom/51601342906.pdf
    • http://lokimutopilar.epizy.com/sonibuguki.pdf
    • https://s3.amazonaws.com/wavunot/pipukiruxogusedowijusig.pdf
    • http://sukotibovaj.epizy.com/bezaditis.pdf
    • https://s3.amazonaws.com/futamo/kigogowopus.pdf
    • https://s3.amazonaws.com/dazovosugev/22309403267.pdf
    • http://bizujexexo.epizy.com/32800614499.pdf
    • https://s3.amazonaws.com/tisegovofu/88960664147.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edce.bin
9f79c22ecdbfb6912e4dbf7a49b1637a89a66800c9d5291d678cd53f60897afa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 5280 bytes
font_01_sfnt_off0000ffd0.bin
c4bd6f8e295882fbcd12fb6689c78ee59b25ed2e6f2575e87aa1caeae5980a74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD0 10364 bytes

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