Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c21995e11950802…

MALICIOUS

PDF

74.0 KB Created: 2021-04-05 11:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0532b3ad0b8eeade3495bce94fde554 SHA-1: 78516c72e722135d3436d25146cb27e62b42701f SHA-256: 4c21995e11950802a324bd0c1fc08092373dc1b3c724018d7777488424ef3690
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-optimized and point to PDF files, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=how+to+adjust+the+height+on+fisher+price+jumperoo
    • https://zipofero.weebly.com/uploads/1/3/3/9/133999904/ratufexo-rapusapenajap-xinenosupex-zejimaluliv.pdf
    • https://cdn.sqhk.co/gisatajofo/vsagcgd/donusaw.pdf
    • https://nogekapufininut.weebly.com/uploads/1/3/3/9/133997605/fa415029a19.pdf
    • http://xatakafigudu.getenjoyment.net/agriculture_farming_books.pdf
    • https://sapobukemofox.weebly.com/uploads/1/3/5/9/135974899/1853307.pdf
    • https://cdn.sqhk.co/poluxofad/gflJrpi/tosuzebotuxisugegiveveke.pdf
    • http://sukaxebodaruju.iblogger.org/phylogeny_and_evolution_of_angiosperms.pdf
    • http://nipawifaxupus.mygamesonline.org/asme_section_viii_division_2_free_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/84037f1d-6f91-481c-8851-d121c6f1d1f2/how_fast_do_sinkholes_form.pdf
    • http://kimovene.epizy.com/zirosexafegagilinexuredir.pdf
    • https://uploads.strikinglycdn.com/files/f2436935-5698-4132-aa30-836e4f74b0a7/canon_mx922_support_code_6000.pdf
    • https://uploads.strikinglycdn.com/files/ddea702c-373e-4419-8434-c563713d1566/wuforevemeropaxetepax.pdf
    • http://wevevaviz.epizy.com/wakomog.pdf
    • http://vipifusofired.epizy.com/1181030701.pdf
    • https://uploads.strikinglycdn.com/files/da5bf9ff-7951-4787-ba59-04b52b9bdac7/how_much_does_being_a_foster_parent_pay.pdf
    • https://uploads.strikinglycdn.com/files/f985373a-b40a-4666-b641-9c701f6975df/gagekifo.pdf
    • http://xutenasejubibe.atwebpages.com/back_to_school_activities_for_middle_school.pdf
    • http://fizanotafogibag.rf.gd/pdf_to_word_arabic_problem.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a7.bin
eaef23aa2b6138e2a6db0f8ae25044d0d18a19c586e3fa70b09a703788b7805d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 5548 bytes
font_01_sfnt_off0000e96f.bin
ebb254946b204699b903491ed64f557d886384bf53cddf3f4a45b07cb94b14e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE96F 10208 bytes
font_02_sfnt_off00010c71.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C71 4324 bytes

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