Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89cf51424170b60…

MALICIOUS

PDF

93.0 KB Created: 2021-03-04 02:08:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: daf33b39153dbfd64e6aef6d3f6e3bf9 SHA-1: 772dbef35585935ce72cd6a9a54ced972ed19925 SHA-256: f89cf51424170b604bf9c73a98a65ab91b4711d6bcec58da676cffa13df931b5
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/award?keyword=pioneer+deh+80prs+vs+pioneer+dex-p99rs PDF link annotation
    • https://lupilonugugi.weebly.com/uploads/1/3/1/6/131637558/5328607.pdfIn PDF document text
    • http://idealsit.space/titration_of_aspirin_lab_report_conclusionahtdo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422876/normal_600fcd12c06c4.pdfIn PDF document text
    • https://karimimeri.weebly.com/uploads/1/3/1/1/131164281/b957d50bb3b8fd.pdfIn PDF document text
    • http://werenntaq.online/learning_management_system_documentation8wchv.pdfIn PDF document text
    • http://apelsins.space/36143982959x0i5z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454547/normal_603e43bdd5553.pdfIn PDF document text
    • http://m-laskin.ru/clinical_pharmacology_made_ridiculously_simple_downloadvw52r.pdfIn PDF document text
    • http://sijubuwejipamun.mywebcommunity.org/tovuwamasazibiwonefezok.pdfIn PDF document text
    • http://kudopifupelixi.22web.org/kendo_grid_group_row_template.pdfIn PDF document text
    • https://tukusalo.weebly.com/uploads/1/3/0/9/130969921/saritopidavaw.pdfIn PDF document text
    • http://woxijakuzadajew.getenjoyment.net/amy_tan_mother_tongue_rhetorical_analysis_essay.pdfIn PDF document text
    • http://tryici.xyz/cribbage_rules_for_dummiesm7zwg.pdfIn PDF document text
    • http://puzexijabin.mypressonline.com/m-audio_oxygen_25_program.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://todizegi.epizy.com/auditoria_interna_x_auditoria_externa.pdfIn PDF document text
    • http://mavusovemoritev.rf.gd/sexuxutazanewe.pdfIn PDF document text
    • http://tokavasetalan.epizy.com/pifuka.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_off00012c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 5456 bytes
SHA-256: 851f2e2e5fa424c3772eb18f054099fb40c828efba344f3f224e8a9ba97e5ec8
font_01_sfnt_off00013eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EEA 11940 bytes
SHA-256: e349bbec978007cec22908f21c191216ee4813077ac836192d3890a854a1187e

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