Malicious PDF — malware analysis report

Static analysis result for SHA-256 84105aca1cd5f357…

MALICIOUS

PDF

79.1 KB Created: 2021-03-20 09:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 12403047a6333756f2cd54e92f66d5f0 SHA-1: 37fef7f057f5bc724feed36b1004c2cf54d7ed52 SHA-256: 84105aca1cd5f35797e0d375d1392ab9019d6a31f2d0c6371a876ce10c6ee209
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and other free hosting services, 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 URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 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.
  • 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=can+samsung+a10e+be+charged+wirelessly PDF link annotation
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/f2db7f01.pdfIn PDF document text
    • https://rigugoxa.weebly.com/uploads/1/3/0/7/130776225/suson.pdfIn PDF document text
    • https://cdn.sqhk.co/lakivasulis/afnv1hf/call_simulator_momo_joker.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/Nggiaji/mukoxizozisuve.pdfIn PDF document text
    • https://buzalunila.weebly.com/uploads/1/3/1/6/131606025/2355837.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/gojinan.pdfIn PDF document text
    • https://cdn.sqhk.co/dajuzafum/jgA2XkY/78726388207.pdfIn PDF document text
    • http://ridovise.sportsontheweb.net/how_many_questions_are_on_the_ontario_security_test.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/92565753161.pdfIn PDF document text
    • http://xakidofe.sportsontheweb.net/rcl_3000_lantern_manual.pdfIn PDF document text
    • https://redelonoxoti.weebly.com/uploads/1/3/1/6/131606094/kusigedibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/referencias_bibliograficas_apa_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eca9a3c-1510-4b94-8560-b11b6807e9aa/how_to_fill_a_tax_declaration_form.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/zivewovubitemufeluroxuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/dinabandhu_andrews_college_admission_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/tirajiwigat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8a83676-7308-4366-aeb2-8a39e601544d/30425359902.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/55191050464.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/dimuwawawibikosatosu.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/pitcher_plant_information_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d645273e-0c61-401a-bf76-1c209a387004/al_quran_academy_london_bangla.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/zulelus.pdfIn PDF document text
    • http://nuluwajewugutik.onlinewebshop.net/21199923633.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_off0000f3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F5 5784 bytes
SHA-256: 17f4904bad0d659cdac65ef0fa47b8d9a167693c5abbc720bdee5c6049b31a9a
font_01_sfnt_off0001078b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078B 11108 bytes
SHA-256: 2e329c8c4ba1553936f3f8f8740849af271e9e5776f0ed92656bfcb0c8aa5d4a

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