Malicious PDF — malware analysis report

Static analysis result for SHA-256 33381e32d1c60f99…

MALICIOUS

PDF

77.9 KB Created: 2021-06-06 19:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3cb82fe3a564151de0483a8854d53fe5 SHA-1: e3a11137dbb593830e5d9ca54c01648e16257440 SHA-256: 33381e32d1c60f99d87214900fbc38ab639c1ba0ad1de834ab96628cfe0f01b5
126 Risk Score

Malware Insights

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

This PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to disposable hosting, likely to obscure the true destination or evade detection. The presence of embedded URLs and the ML classification strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/123?utm_term=ethyl+chloroformate+boiling+point PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369330/normal_5fdeab7bd914c.pdfIn PDF document text
    • https://guxemufisi.weebly.com/uploads/1/3/2/7/132710659/7333962.pdfIn PDF document text
    • https://gajaxaja.weebly.com/uploads/1/3/2/7/132712369/zadimuxa_jajogabe_sugafoduro.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5ff7be1a70555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499935/normal_602aa3c1efcf2.pdfIn PDF document text
    • https://velulaganivuvoj.weebly.com/uploads/1/3/4/4/134438708/6012191.pdfIn PDF document text
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/81c7246474a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370078/normal_600122931fb8f.pdfIn PDF document text
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/sebom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446382/normal_60134d7026d6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479923/normal_5fda39570f04e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371267/normal_604fb984dad4d.pdfIn PDF document text
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/kobatanumizowisul.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427103/normal_5fee4729c32a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476580/normal_603f32515c6ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144581223/11893443309.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144423876/slumdog_millionaire_book_macmillan.pdfIn PDF document text
    • http://dajodovilav.pbworks.com/w/file/fetch/144604257/cover_letter_template_download_word_free.pdfIn PDF document text
    • http://xizalow.pbworks.com/f/le_mariage_de_figaro_acte_iii_scne_5_analyse_linaire.pdfIn PDF document text
    • http://namikikis.pbworks.com/w/file/fetch/144518460/6.pdfIn PDF document text
    • http://wepoline.pbworks.com/w/file/fetch/144678366/12869680827.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_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 5448 bytes
SHA-256: 21c6fc44b5f1c0893260cabaaa7191941ef5564e06f695e3115b64320340cca4
font_01_sfnt_off00010208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 11352 bytes
SHA-256: 1a000362626f9bc65ce9ba7423a926042926025a0bb961b0224c43e242fbe5d6