Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbbc19437533e8a9…

MALICIOUS

PDF

76.7 KB Created: 2021-03-29 20:51:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1f97edf583ff9aad3c06204a0bc95ac5 SHA-1: da584b969c9d15246169151155d6b8a1be0f6107 SHA-256: cbbc19437533e8a99015ba1572f481259fa5b07737351f0e5f04ee4925d9bac4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'concrete formwork installation'. No scripts were extracted from this sample.

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://zajinet.ru/strik?utm_term=how+to+install+concrete+formwork PDF link annotation
    • http://megalit-korolev.ru/rhetorical_grammar_for_expository_reading_and_writing0938v.pdfIn PDF document text
    • https://cdn.sqhk.co/zivuwimavez/giangcW/83289619040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416322/normal_603e703c38922.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/eIOCmhb/kiforobinokusu.pdfIn PDF document text
    • http://zifufarox.getenjoyment.net/afficheur_lcd_arduino_programme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464067/normal_600a717719306.pdfIn PDF document text
    • http://ru-order-687646765445.art/study_skills_for_high_school_students_worksheetsf0v18.pdfIn PDF document text
    • http://freds.space/bogumomonosemejebapuru4ovmi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476123/normal_6020d01b03809.pdfIn PDF document text
    • http://kawlites.online/carl_jung_arquetipos_e_inconsciente_colectivonqoqv.pdfIn PDF document text
    • http://kagifosotumaden.iblogger.org/jadapolejifo.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/which_cuisinart_waffle_maker_is_best.pdfIn PDF document text
    • http://businessmentality.com/gikafomog13v65.pdfIn PDF document text
    • http://kebukodakaver.iblogger.org/what_is_product_service_innovation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tifavamifikas.myartsonline.com/44942982349.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_319ae4aa15284d338be6113b3475a644.pdf?index=trueIn PDF document text
    • http://beroseji.epizy.com/fitujopedimumut.pdfIn PDF document text
    • http://melewurimepuja.rf.gd/45943162301.pdfIn PDF document text
    • http://fodakobenolam.rf.gd/area_of_right_triangle_worksheet.pdfIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_02f5a74c9c4646c88ec0d071aa770080.pdf?index=trueIn 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_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 5144 bytes
SHA-256: 180d7499351c75be252fd587167ce8ceee43709b44ccb35c84ba338af65e997c
font_01_sfnt_off000101fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FE 10484 bytes
SHA-256: 0743ca39f5024c983ea86badebcb2944d10ad4d6bbc2b6a17b1cd9ba5c0e5b03

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