Malicious PDF — malware analysis report

Static analysis result for SHA-256 62dce86039ef061a…

MALICIOUS

PDF

71.4 KB Created: 2021-02-16 19:04:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fc8484d90f6b486ce08f62c7ea0eb055 SHA-1: e4f781906d940d03828c8084ae08bd2673057d93 SHA-256: 62dce86039ef061a2a1cdc86e6684b26254a4993c89bb244a9cdfe39a2237d77
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs and the 'link farm' heuristic suggest a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the document's structure and embedded URLs point towards an attempt to redirect the user to malicious content, likely for credential harvesting or further payload delivery.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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=us+history+shorts+the+colonists+unite PDF link annotation
    • https://cdn.sqhk.co/kekotenonaxu/dgfkhdI/84604266869.pdfIn PDF document text
    • http://aycotoro6.xyz/962220260588ba33.pdfIn PDF document text
    • https://cdn.sqhk.co/rapurakoke/UkygcMD/subway_princess_jungle_adventure_sims_4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485939/normal_5ff57b056f306.pdfIn PDF document text
    • http://topshops.website/running_on_empty_stomach_muscle_lossdqtsd.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/3uVAW4B/unicorn_color_by_number_pixel_art_coloring_game.pdfIn PDF document text
    • http://lnstagram-helps-contact.com/work_cited_mla_format_generatordrbi6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_6022b13739355.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462339/normal_5ffefe4620e24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448713/normal_5fffa6f8e12b9.pdfIn PDF document text
    • http://kkkirrreeee.space/70234673517bbpmm.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/ezhdidy/kovukowadasasikunem.pdfIn PDF document text
    • http://svoylend.xyz/bits_pilani_dubai_application_formk3id5.pdfIn PDF document text
    • http://fibilif.iblogger.org/xegusifuxamagekopu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451220/normal_5feb5ef747357.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nirutavikuda.epizy.com/logistic_regression_analysis_reporting_results.pdfIn macro / runtime command snippet
    • 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_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 4772 bytes
SHA-256: 169a758e0878d3754cac968d2e5407663dcea33e149ecc7344fda8aabe8ced87
font_01_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 9864 bytes
SHA-256: 2b88a3ee015654eb87a87f351e2d930de9347499d228c82e5ae1c4fc6a097702

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