Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb5290e882cb589…

MALICIOUS

PDF

91.1 KB Created: 2021-03-19 04:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4ab9c2a36c293b6e607485b94262bab8 SHA-1: 791b9635962a309ad57822fca96a5d5f7894984f SHA-256: ccb5290e882cb58953f0139c29d8423dbd1ff57e6e2e2f12a51ff20af40bfd80
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically appearing as a search result for 'what is the formula of newton's first law'. This suggests a phishing or social engineering lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://leonvi.ru/strik?utm_term=what+is+the+formula+of+newton%2527s+first+law PDF link annotation
    • http://koprovk.xyz/lomelituditakuduph9b23.pdfIn PDF document text
    • http://vknart.xyz/nivamokmrpwl.pdfIn PDF document text
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/7329974.pdfIn PDF document text
    • https://keladita.weebly.com/uploads/1/3/0/7/130739570/bfd22b9920d1.pdfIn PDF document text
    • http://gajaxujifusokul.mygamesonline.org/83182892740.pdfIn PDF document text
    • https://tusosalowikos.weebly.com/uploads/1/3/1/4/131453146/rodegitavekikagoke.pdfIn PDF document text
    • https://cdn.sqhk.co/nomelafu/jdhdhdE/chevy_stepside_for_sale_alberta.pdfIn PDF document text
    • http://bovibuvebus.getenjoyment.net/best_reader_for_android_smartphone.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/modern_chemistry_chapter_8_review_answers.pdfIn PDF document text
    • http://vatetuda.scienceontheweb.net/fimegipizekunin.pdfIn PDF document text
    • https://cdn.sqhk.co/pegebatanuz/hfFKC6n/airlines_information_systems.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/pagaxirusupuzazisulidi.pdfIn PDF document text
    • http://giwewigipebi.medianewsonline.com/is_grant_income_taxable_uk.pdfIn PDF document text
    • http://uscreditinquiry.info/44952015210hvlqc.pdfIn PDF document text
    • http://chebsvet.ru/spyro_canyon_speedway_orblnbir.pdfIn PDF document text
    • https://cdn.sqhk.co/gewigerajoru/UWgcnSM/planet_fitness_membership_fees_during_covid.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/CFiaRje/pewobewawok.pdfIn PDF document text
    • http://memiwuv.mygamesonline.org/disadvantages_of_captive_insurance.pdfIn PDF document text
    • http://gapilojazixo.getenjoyment.net/sizafi.pdfIn PDF document text
    • https://xivunububan.weebly.com/uploads/1/3/0/9/130969166/gijuxedusamip_nujokuxemekeza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/948845fb-a2e3-487f-ba0d-c0699e35c036/ohms_law_simple_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e22d61e-70da-4a08-be26-ee5e6b8a4944/67247964248.pdfIn PDF document text
    • http://jumawivowibeb.onlinewebshop.net/33306951809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c28e4ebd-1eac-42e7-99bd-101968177c71/15720559278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4dd94ef-41a8-480c-a897-974c39a3bac1/61421538214.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F25 5144 bytes
SHA-256: 53e3ee6ab830a98b0ffc7c7394b6ecb7bc7d5b823bdc2b6b2a4373e239c7e8a6
font_01_sfnt_off0001209b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209B 12100 bytes
SHA-256: d4088125bd92800a031d08cf9bf7950d30486111f34507c7570df995f96e2c27
font_02_sfnt_off000148e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E5 16128 bytes
SHA-256: d44d52ef66720e7299aa23375668eb807971917d9a72a2eac4a2c392e38f6666