Malicious PDF — malware analysis report

Static analysis result for SHA-256 131ecf5363256bff…

MALICIOUS

PDF

74.7 KB Created: 2021-03-08 20:56:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 64c0cc027b28c20bf5b42df33b2fd041 SHA-1: a9338509d3f44e0395340e7a5b25e8b228d41536 SHA-256: 131ecf5363256bff44e875c53c37dd22e5b433061d8ecf9be3d6fcee92becd09
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. This suggests the primary purpose is to redirect users to potentially malicious websites, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/aws?utm_term=xbox+one+controller+custom+sticker PDF link annotation
    • http://sowopezamiw.medianewsonline.com/13493723918.pdfIn PDF document text
    • http://numulul.mygamesonline.org/gunikilaz.pdfIn PDF document text
    • https://xopozutafedas.weebly.com/uploads/1/3/1/4/131453480/6277522.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/analisis_del_libro_la_tregua_de_mario_benedetti.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/jixivabinewerokume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_5fe73689b89ac.pdfIn PDF document text
    • http://ufenmac.com/sita_on_the_road_movie_online03x9w.pdfIn PDF document text
    • https://fejurisikem.weebly.com/uploads/1/3/0/7/130740008/1118810.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/migivasamomas.pdfIn PDF document text
    • http://fafesixokegigi.getenjoyment.net/physical_education_learning_packets_14_weightlifting_answers.pdfIn PDF document text
    • http://bexixibeguben.sportsontheweb.net/the_hunger_games_catching_fire_novel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497370/normal_5ff790b7356ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470826/normal_5ff522de31088.pdfIn PDF document text
    • http://delaem-sami.online/lirik_big_bang_fantastic_baby_dan_terjemahang84vc.pdfIn PDF document text
    • http://nibelv.xyz/zorisokekuporewabefufikei1dm6.pdfIn PDF document text
    • http://xepelewatelaziv.getenjoyment.net/honda_hrr216k9vkaa_service_manual.pdfIn PDF document text
    • http://pebunoguge.mygamesonline.org/harry_potter_half_blood_prince_blurb.pdfIn PDF document text
    • http://stopro.store/amd_a68h_chipset_driveriun47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370068/normal_5ffbceeeb1f25.pdfIn PDF document text
    • http://devicesprotectionforusers.site/national_game_of_canada_in_present6jfy7.pdfIn PDF document text
    • https://vivuguduwidu.weebly.com/uploads/1/3/2/6/132681484/potubupo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kivozusemu.atwebpages.com/wijipusiserukuzifimed.pdfIn PDF document text
    • http://gonegexunu.myartsonline.com/what_is_creative_development_in_film.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/giwasetimo.pdfIn PDF document text
    • http://xobebol.onlinewebshop.net/curso_de_ingles_para_medicos_gratis.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_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 4984 bytes
SHA-256: 4d37dc15d71e73941ec097882a3dc0d58530c0e2778a21411f3d6fe5975ab2f2
font_01_sfnt_off0000fa13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA13 10308 bytes
SHA-256: 213bd1e1bd82044231b6c4e261395d999f5ce7158afb12e46c89ec10146d14fa

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