Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac40f3ca0f1941f2…

MALICIOUS

PDF

70.8 KB Created: 2021-03-03 01:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 9016ca404ddf94794ef8cd6032783f48 SHA-1: 6899ed8b63e92fbca50f4c38f30d9ffeac54fd50 SHA-256: ac40f3ca0f1941f27265b4168b2ea8821ab85ab4e6a55572f7cb1a176ca8708b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a lure to external malicious content, likely involving JavaScript execution within the PDF viewer.

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://pelibifir.ru/strik?utm_term=guitar+method+book+2nd+edition PDF link annotation
    • https://dedopaka.weebly.com/uploads/1/3/4/4/134498192/vexuwuf.pdfIn PDF document text
    • https://radisowe.weebly.com/uploads/1/3/4/3/134366404/37962d49275.pdfIn PDF document text
    • http://onenature.space/lesipegoduzijuzakuftd6ye.pdfIn PDF document text
    • http://bioforce-co.site/safety_inspection_report_sample_docpbcfg.pdfIn PDF document text
    • https://taralibupub.weebly.com/uploads/1/3/4/3/134372711/b9c6935fa72.pdfIn PDF document text
    • http://rerubin.space/simplifying_algebraic_expressions_worksheets_7th_grade_with_answersqmqez.pdfIn PDF document text
    • http://jezopapurowejen.22web.org/21543672959.pdfIn PDF document text
    • http://mamajan.space/castrol_oil_guide_for_trucksglzm0.pdfIn PDF document text
    • https://toposizijud.weebly.com/uploads/1/3/0/7/130776562/donidizuf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401555/normal_5fc6c66e231e5.pdfIn PDF document text
    • http://tortomsk.ru/naradohdo3m.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369653/normal_5fdb7e34bac37.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://warunero.rf.gd/what_is_the_importance_of_data_structure_in_programming.pdfIn PDF document text
    • http://jozadedosirokeb.rf.gd/arduino_library_for_proteus.pdfIn PDF document text
    • http://bunizavax.rf.gd/39932784486.pdfIn PDF document text
    • http://rafodize.rf.gd/26316891554.pdfIn PDF document text
    • http://kikujebi.epizy.com/pituruxurigazer.pdfIn PDF document text
    • http://delupujak.epizy.com/39960099982.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_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 5224 bytes
SHA-256: 93861e14e21569464c58ae511d570c3e78fdfdddf722e720d4efb8203950fa01
font_01_sfnt_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 10256 bytes
SHA-256: 0eee975912b991dfc715e0bcb22ef04dc5014e02eb449638cb44c2dcbe4858e1

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