Malicious PDF — malware analysis report

Static analysis result for SHA-256 2811a914fb2b7bc0…

MALICIOUS

PDF

81.1 KB Created: 2021-03-15 01:17:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9952a63245bbefcbc7bdf152bd6f174c SHA-1: aa38ae41a94d2a792aeecebd0aabe36e9894463a SHA-256: 2811a914fb2b7bc0c6f9df0b5e28ef12d9531576cec35fa4d973b96663bc0e19
94 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, with numerous URLs pointing to disposable hosting. The PDF document body contains obfuscated text and references to 'wkhtmltopdf', suggesting it was generated programmatically. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0445

Heuristics 4

  • 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
  • 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=top+french+english+dictionary+apps PDF link annotation
    • https://cdn.sqhk.co/gedugari/Zc5hhy3/saluwavuvuligiw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502493/normal_5ffae5d813466.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375199/normal_5ff3c368be12d.pdfIn PDF document text
    • https://cdn.sqhk.co/bijukipuj/c3YUid1/montessori_assistant_teacher_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirurafixi/hhSjbig/428_super_cobra_jet_crate_engine.pdfIn PDF document text
    • http://xapepinozex.22web.org/template_letter_for_cancelling_car_insurance.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460476/normal_602fa87ad0088.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387703/normal_6001918c93cae.pdfIn PDF document text
    • http://merulabodonulu.iblogger.org/bruins_rumors_bleacher_report.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/gcRNifM/venologibixabaderevepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_602c3ff19f97d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455894/normal_60416240db900.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/ijeoifp/21742239107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491927/normal_603cacb8cb29e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476427/normal_6036950f89331.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378621/normal_601d89b882dd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvexarido.epizy.com/bagolobijasu.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/cuestionario_apgar_familiar.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/gejewipab.pdfIn PDF document text
    • http://desavoz.epizy.com/integrated_rate_law_practice_problems_and_answers.pdfIn PDF document text
    • http://vovugawe.rf.gd/giddens_sociologija.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/is_online_emdr_effective.pdfIn PDF document text
    • http://nuvofuniwurux.epizy.com/sudekoputesikanix.pdfIn PDF document text
    • http://datufubizut.rf.gd/lakexalelumotobem.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/samiran_das_hit_baul_song.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/zujazerogil.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 3212 bytes
SHA-256: 27b748ee931503da7bbd748c21e6b962001e2b36dc9ea055ea975387d771fc72
font_01_sfnt_off000106a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A9 5468 bytes
SHA-256: 8e7c9c49de54d082b65c628bb705403cf6c31132c60d9c01677a011ccdf54ffd
font_02_sfnt_off0001194c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194C 11256 bytes
SHA-256: 7991c897aabff246bf3a9ce0dbb4b170285063abbf32d7b3cd72bc274e812b6b

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