Malicious PDF — malware analysis report

Static analysis result for SHA-256 79670e8e98fd77c6…

MALICIOUS

PDF

77.5 KB Created: 2021-02-21 16:24:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d012b89ee8c9dd9d48474ddd1a2497d1 SHA-1: 9e16ca54d12ffb0d98634b3ccececa594eaaad70 SHA-256: 79670e8e98fd77c65df325138178986437ea176dd7d5ca6400b9fa0757b4d1da
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent link pointing to 'https://bologen.ru/123?utm_term=prentice+hall+gold+algebra+2+1-4+answers', suggesting a lure related to educational content. The PDF's structure and the presence of embedded URLs indicate it's designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=prentice+hall+gold+algebra+2+1-4+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374181/normal_601a13066b198.pdfIn PDF document text
    • http://tojipipawerar.22web.org/xazaviwose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420927/normal_601770d067b38.pdfIn PDF document text
    • https://totaduwuvib.weebly.com/uploads/1/3/0/9/130969262/gizex.pdfIn PDF document text
    • http://sudiwemubitep.22web.org/dozewakiruzoru.pdfIn PDF document text
    • https://felipivi.weebly.com/uploads/1/3/1/8/131856333/gufuwelipaj-padow-befisikolagi-pigazezakofevu.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/hfNiEP1/gewabexuno.pdfIn PDF document text
    • https://divebofa.weebly.com/uploads/1/3/4/6/134690115/foret.pdfIn PDF document text
    • http://melodabogaso.66ghz.com/temofipuzifuled.pdfIn PDF document text
    • http://tulalenabeparuk.iblogger.org/punctuation_worksheets_ks2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417413/normal_5fd625b2366be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lezapogitoda.rf.gd/43754651737.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/77856191569.pdfIn PDF document text
    • http://tereralubo.epizy.com/flight_of_bumblebee_piano_sheet_free.pdfIn PDF document text
    • http://migegavirunafo.rf.gd/forms_an_acidic_solution_in_water.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_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 5740 bytes
SHA-256: ae90daead2bcf8e8b3d7f1c7d976e05b798817a65601a5364a9636263e49cb9e
font_01_sfnt_off00010032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10032 12528 bytes
SHA-256: f593a560f2e0cdefb5660aaa3f4a71881954cb426717c05ceff305bdc527a23a

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