Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aac07a2891dc009…

MALICIOUS

PDF

78.1 KB Created: 2021-04-25 02:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 4b224a8fc7612c5c6c9c9fee1e754719 SHA-1: d72e4738570509d583ea1fb2e744dfce42364b91 SHA-256: 2aac07a2891dc009578d27f3b5d2284258c23f7fec4c04de23c22ce4d3b300fe
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a suspicious domain, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/strik?utm_term=how+to+use+the+garmin+astro+320 PDF link annotation
    • http://dmdmassage.com/749851738564z4aq.pdfIn PDF document text
    • http://kokulotasuz.mygamesonline.org/nalifirewawajumer.pdfIn PDF document text
    • http://subexadedesu.iblogger.org/45135922175.pdfIn PDF document text
    • http://mekujoviwe.mypressonline.com/tracheostomy_care_protocol.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/kokapsfy4e.pdfIn PDF document text
    • http://pokulumaj.iblogger.org/eureka_enviro_steamer_pads_60675.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/41254286959.pdfIn PDF document text
    • http://fulifubajamo.mywebcommunity.org/organelos_de_las_celulas_eucariotas.pdfIn PDF document text
    • http://gukivuzijisuva.getenjoyment.net/26707457639.pdfIn PDF document text
    • http://gonifarej.mywebcommunity.org/cic_catecismo_da_igreja_catlica.pdfIn PDF document text
    • http://wisecreditscore.info/riwavuditasumexmdl43.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/study_island_answer_key_for_5th_gradec4dh2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bunokupisosep.epizy.com/caregiver_background_check_form_wisconsin.pdfIn PDF document text
    • http://japamitafixe.myartsonline.com/sevitawoneronigikiwanusu.pdfIn PDF document text
    • https://84daacc9-7e90-4c5d-b1ed-526950900c49.filesusr.com/ugd/73f3b0_cfcba482b3014f06ae8e8c612eda1e82.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/barriers_to_effective_cross_cultural_communication.pdfIn PDF document text
    • http://nibizuladode.onlinewebshop.net/patoviv.pdfIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_b252cba93eee496fa45501e49d4a07ae.pdf?index=trueIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_490760fedb0d462ca234534a22bbd95d.pdf?index=trueIn PDF document text
    • https://aca292c6-a3ee-4c96-b4c9-db15c8eca1b9.filesusr.com/ugd/cd1d52_289c082004774c9fa77b9400f7570a80.pdf?index=trueIn PDF document text
    • https://be8f41f0-9ddd-434d-ab6d-aa755a40b80d.filesusr.com/ugd/726d9c_c166344d6c3f436686fb90db6a669966.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefipa/88950065070.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/harry_potter_house_quiz_pottermore_full_quiz.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_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 5560 bytes
SHA-256: 08c78dd8ac2fcd1a7a64ec8b360750ee079dcf7c59b0f33666ef0f76da3c01ba
font_01_sfnt_off0001085b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 10240 bytes
SHA-256: 5baf7e41f10c94528a90a47709b64829493c2302c386d0a70aa31f1a726f44cd

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