Malicious PDF — malware analysis report

Static analysis result for SHA-256 981675b4f3006e8d…

MALICIOUS

PDF

70.9 KB Created: 2021-05-12 20:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 248d87db77e39a159a1ef077f8279730 SHA-1: e0cd282844494f7e90beb04dd4edf41ba4aa6b58 SHA-256: 981675b4f3006e8d3fccb7c1165833bad4663b7d047ebfa4f5d6608876ef69d1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=canon+ip90+ink+cartridges PDF link annotation
    • http://lazategomid.scienceontheweb.net/blades_in_the_dark_portugues_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunadegu/hAkheK7/tuxezew.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/liste_adjectif_francais.pdfIn PDF document text
    • https://doxuxipineza.weebly.com/uploads/1/3/0/7/130740192/58182eff7.pdfIn PDF document text
    • http://vasakuso.sportsontheweb.net/how_to_learn_woodworking_skills.pdfIn PDF document text
    • https://disemiseses.weebly.com/uploads/1/3/1/4/131407045/deroranagojudavutoji.pdfIn PDF document text
    • http://xakaderinetatu.mygamesonline.org/every_praise_hezekiah_walker_chords.pdfIn PDF document text
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/5197343.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/Tzgd1gc/yellowstone_national_park_weather_in_may.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/2qgggf8/transference_in_therapy.pdfIn PDF document text
    • http://bagezokazuraw.medianewsonline.com/march_2020_calendar_kalnirnay.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/aSTGWnC/hd_wallpapers_for_iphone_5s_cars.pdfIn PDF document text
    • http://bawazofo.getenjoyment.net/jexirorejumagar.pdfIn PDF document text
    • http://logunesunoj.medianewsonline.com/parasitos_artropodos.pdfIn PDF document text
    • https://cdn.sqhk.co/lesasafo/dhfWvhb/gojiwosogiditusawenafa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45180a89-8b92-4d54-a4c6-cdf0ad6af3c7.filesusr.com/ugd/2b98a3_63ec68e243b34d048a3879debdefa069.pdf?index=trueIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_5617db648259436d87289d0e0fb3de4c.pdf?index=trueIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_148d0767078742189012d0afe82a6137.pdf?index=trueIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_9428824d1ecb40529741df39778bf0e4.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_99669e574897428b8a95d86a9c0b9cdd.pdf?index=trueIn PDF document text
    • https://1d78cdce-0032-4a75-b9f1-030f6b068c24.filesusr.com/ugd/32f660_a276fce0ec614178a43c104dbd7ee9c6.pdf?index=trueIn PDF document text
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_bec7845d2ed24d7fa2628127c1904b33.pdf?index=trueIn PDF document text
    • http://zedowep.atwebpages.com/nosat.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_off0000d9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C8 5476 bytes
SHA-256: 9248ea8ae99b4421ac6f3dc8f4e52537e62b77131927668b07e71bbaa705b845
font_01_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 9884 bytes
SHA-256: 0573d8a56ae35dde4750c7559c71d141c3618b2fcbe4f6f157bd1ffcd96fd6b3