Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f1c0f59761fdca…

MALICIOUS

PDF

79.6 KB Created: 2021-03-29 16:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d83417cfb12a094be40dbcf39e61df4a SHA-1: d8c6a7cf0d3f93a9afc760ac4d609a40330e9e57 SHA-256: 89f1c0f59761fdca4561d42db47146b28b532be3b54ca6326bb7c0e6b3207e73
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms or phishing campaigns. The embedded URL and the heuristic firings indicate a malicious intent to redirect users to potentially harmful sites. While no scripts were directly extracted, the PDF structure and link farm heuristics suggest an attempt to manipulate search engine rankings or lead users to malicious content.

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://soxebez.ru/wix?keyword=bush+school+of+government+ranking PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490127/normal_605b92e3da2c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_603ed4ad292ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451736/normal_5fcb8f72ee0e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380073/normal_6031080e9e1cf.pdfIn PDF document text
    • http://sudilufib.getenjoyment.net/gugumujirokep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_60594626b277c.pdfIn PDF document text
    • http://rolorutebu.sportsontheweb.net/excel_mathematical_formulas_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446395/normal_605ad0ad695e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_600baa0804942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477863/normal_603bd8d5ef012.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404124/normal_601cda7564276.pdfIn PDF document text
    • http://sogejovep.mypressonline.com/how_to_turn_off_intermatic_timer.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/ad7614b9-a377-49bf-ab6e-d8dbcf2941df/felufunezapotezazawox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6e6c3e9-37ec-4e8f-96fa-00fc9f2ee5d4/how_to_learn_algorithms_easily.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd30f72-72b7-49ae-bcac-159511ddb32d/chauvet_obey_70_software.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/79916749590.pdfIn PDF document text
    • http://sogurorirerew.onlinewebshop.net/backwater_tourism_in_kerala.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/dreams_tamil_movie_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/66972802637.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c902efc-b2da-49cd-8dfe-9461753530a2/doctor_zhivago_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aea7ebc-f88c-4d7f-b0d6-13d12e22c913/73786819055.pdfIn PDF document text
    • http://sakogabutal.onlinewebshop.net/biotecnologia_industrial.pdfIn PDF document text
    • https://0f285ee0-1b14-49a2-8a3e-060a2db94812.filesusr.com/ugd/4bf67f_5b56797af4c24a4cab345898d09a740d.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_60f2f9057c464bd38aef7515de8aa680.pdf?index=trueIn 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_off0000f688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 5468 bytes
SHA-256: ec1a366fa291cbee9aec09b62bd1fbfc1e88c5afdf6cb71720ddf4b46190092e
font_01_sfnt_off00010907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10907 11784 bytes
SHA-256: 9b0e1fdb44824de55b2406ff9da0dacc78d3762e5d6093fd27f75e1a2de8ba4b