Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3fa6ab45152a0b…

MALICIOUS

PDF

73.2 KB Created: 2021-04-11 18:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ff62cead3a4588963224f4fb32263a92 SHA-1: 7847e984c476b0f81374d10d4f7d20bb19217bd1 SHA-256: ab3fa6ab45152a0bd971e59ac5653fa10b414fab9be4d90faa200e698949ead2
126 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one specifically pointing to 'jacksth.ru/strik', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, further supporting its malicious intent. No scripts were extracted, but the presence of many external links implies an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=define+culture+ap+human+geography PDF link annotation
    • http://takojezama.22web.org/agnello_di_dio_picchi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458132/normal_600a74dcd9574.pdfIn PDF document text
    • http://nipilexunelok.22web.org/37092488622.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413370/normal_5fc81402dc207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_60426f90e3f30.pdfIn PDF document text
    • http://lidisafudototi.iblogger.org/cambridge_o_level_maths_past_exam_papers.pdfIn PDF document text
    • http://komejab.iblogger.org/bright_side_kim_holden_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejeseja/certificato_di_conformit_urbanistica_chi_lo_rilascia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/772db64c-085b-4089-be07-bd877a945272/93441350375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c44de69-9735-4fa1-b3fa-738b49112f52/66169227067.pdfIn PDF document text
    • http://fejesaj.epizy.com/jasoxe.pdfIn PDF document text
    • http://viwokapexonilef.rf.gd/zidukevuwexoxijuvadenozil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4161b1-07ad-4992-ac5c-5cba14795f27/kabekufulariputagujop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3356574d-207c-47d0-862e-ed8123a0beee/wixidumaxamikog.pdfIn PDF document text
    • http://lewizalejeso.rf.gd/unix_commands_with_example.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/dragon_s_dogma_everfall_loot_guide.pdfIn PDF document text
    • http://sopazanit.rf.gd/hit_and_run_texas_report.pdfIn PDF document text
    • http://zezatavaveb.epizy.com/sterilization_in_microbiology_laboratory.pdfIn PDF document text
    • http://taxifegizuni.epizy.com/figure_of_speech_worksheets_5th_grade.pdfIn PDF document text
    • http://jinapemejasubat.rf.gd/23502019146.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_off0000e03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03A 5352 bytes
SHA-256: 20716c9b2a7541dd6e86b0032c6df19d90e9fd71d5e757ffdb78ab1bb8f1ba76
font_01_sfnt_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 10960 bytes
SHA-256: d49fa22ccc647e8e01eb4a25d6a34a3aa64c2072a880de589c8805b08ddc2dff

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