Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aea0218f32f76d4…

MALICIOUS

PDF

77.6 KB Created: 2021-02-21 21:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ac7b69e130508110459367e0f9b4953f SHA-1: b5453c85e5b7519be6eb90485d139815c5486f58 SHA-256: 9aea0218f32f76d425fc37065bcff1e83a84850e06c823ab57d1009c319f95f0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm hosted on disposable domains, with one primary malicious URL being https://bologen.ru/strik?utm_term=blheli+12a+esc+manual. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. No scripts were extracted, but the overall structure and URL findings point towards a phishing or malware distribution attempt.

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/strik?utm_term=blheli+12a+esc+manual PDF link annotation
    • https://cdn.sqhk.co/norumuwapa/ifVLgcy/73330496763.pdfIn PDF document text
    • http://aslixan.com/jozibeb277c1.pdfIn PDF document text
    • https://cdn.sqhk.co/garisuvonuk/ePGGjeb/pulajagejogefifetumotufok.pdfIn PDF document text
    • http://zoosalon.org/modals_ability_obligation_prohibition_advice_exercisesqagyd.pdfIn PDF document text
    • http://glasshookahcatering.com/wiwododulukilowiniwife613bx.pdfIn PDF document text
    • http://yoptan.space/maxenofosedegabaxurebcsdv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404292/normal_5ff5d2e20b53b.pdfIn PDF document text
    • http://frukt.fun/summer_escapes_pool_pump_canadaglghc.pdfIn PDF document text
    • https://cdn.sqhk.co/zodunoxurob/heidhdI/toleg.pdfIn PDF document text
    • http://bizawojumufa.22web.org/french_waters_crossword_answer.pdfIn PDF document text
    • https://cdn.sqhk.co/gorisaburo/hEhigj7/fibibizosunulos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468828/normal_5fe296fd73393.pdfIn PDF document text
    • http://mugedly.xyz/atkins_fisico_quimica_8_edio1s323.pdfIn PDF document text
    • http://dsv-trening.ru/macbeth_socratic_seminar_questions_and_answersmex6s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kofuzedu.epizy.com/richard_burton_diaries.pdfIn PDF document text
    • http://gumelojapa.epizy.com/getivep.pdfIn PDF document text
    • http://mevumum.epizy.com/wawobure.pdfIn PDF document text
    • http://nexuvojof.epizy.com/business_plan_template_executive_summary.pdfIn PDF document text
    • http://topagujowulefe.epizy.com/casio_watch_water_resistant_200m.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_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 5176 bytes
SHA-256: 8aa675f1dd7d2eba7f3d9444490597afac6342401885a52fe7c5a01ac9f1c089
font_01_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 11068 bytes
SHA-256: d262a959f15ced694ead511893f3ffc2edf6bd5d4d016203ed40c0de8d863645

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