Malicious PDF — malware analysis report

Static analysis result for SHA-256 872365504069b4ed…

MALICIOUS

PDF

80.3 KB Created: 2021-04-16 04:14:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 896be5b813c8a7826c72db664214e23c SHA-1: 5245fd54f7dd3a71c77c552054d0df438325965c SHA-256: 872365504069b4eda74717322a2ec5ad5d58b07abd2407cc9cafc31a02fb98bb
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, includes metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The presence of external URIs indicates an attempt to redirect the user to a potentially harmful site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://xajibur.ru/strik?utm_term=when+i+play+my+guitar+why+does+it+buzz PDF link annotation
    • http://gapofar.22web.org/40892071814.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465259/normal_60417b0393021.pdfIn PDF document text
    • http://jirusulixozome.scienceontheweb.net/65280551216.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/97134861694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427799/normal_5fd7d7dad8928.pdfIn PDF document text
    • http://diwokaxojizo.iblogger.org/algebra_linear_equations.pdfIn PDF document text
    • http://rigizaba.iblogger.org/power_smart_db7651-24_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_604d2215f0a53.pdfIn PDF document text
    • http://nefufovej.22web.org/how_to_fix_a_mercury_thermostat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fasilew.epizy.com/hpv_treatment_guidelines_2017.pdfIn PDF document text
    • http://winigoset.rf.gd/bakuvupunox.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/crude_oil_report_eia.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/16877747327.pdfIn PDF document text
    • http://rilimopukalus.rf.gd/menama.pdfIn PDF document text
    • https://s3.amazonaws.com/kewakuko/how_to_be_a_corpsman_in_the_marines.pdfIn PDF document text
    • https://s3.amazonaws.com/mogipegi/hoist_v5_used.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/24317745525.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/gift_certificate_hotel_template.pdfIn PDF document text
    • http://mofagadelebedos.rf.gd/call_of_duty_apk_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/56752432555.pdfIn PDF document text
    • http://sabixukavizom.myartsonline.com/fekokifanimabixus.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_off0000f91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91C 5768 bytes
SHA-256: 3f7953270ef1bb4ba4104330bda9996952314b19f0378eafb3511dbc33248745
font_01_sfnt_off00010cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBA 10844 bytes
SHA-256: 30f459e95a611adf8da773998aaec91a50661070c3f73aba525691320a35d9dc

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