Malicious PDF — malware analysis report

Static analysis result for SHA-256 48fe5e030ab86d49…

MALICIOUS

PDF

71.4 KB Created: 2021-02-24 05:08:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: eb3824bfbf21d5c0ebfa1757cc8d33de SHA-1: af820c543cf28c57604ae87949fb397385502b80 SHA-256: 48fe5e030ab86d4912eec9436697d1efc58f5ee920ad4cbe3e5e118d7dbbcc56
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the 'Urgency / deadline lure' heuristic further support a phishing attack pattern, likely using a spearphishing attachment to deliver a payload.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=sample+security+guard+test+questions+ontario PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450507/normal_5fe3d9c725b9e.pdfIn PDF document text
    • https://cdn.sqhk.co/pukefoxer/hhjjjjj/world_war_3_2020_astrology.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/jgieAjc/pewalebodibulelojiw.pdfIn PDF document text
    • http://gepatoxax.iblogger.org/kezujutobibuvodan.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/hhvxfjP/5083822253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402948/normal_5fe92836c042b.pdfIn PDF document text
    • https://cdn.sqhk.co/lumolixuwo/5hc4IWK/p3_tips_app.pdfIn PDF document text
    • http://wijebibot.iblogger.org/apache_tomcat_latest_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_6027deadb21d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389804/normal_5ff71255b560c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suwetiwojiza.rf.gd/answering_machine_sound_effects.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/pomufixumetanariduvizima.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/62887549488.pdfIn PDF document text
    • http://burafidofa.epizy.com/ralepoxitu.pdfIn PDF document text
    • http://wowinagapujepok.epizy.com/physics_11_constant_acceleration_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/ap_human_geography_textbook_the_cultural_landscape_13th_edition.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_off0000d81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81E 5724 bytes
SHA-256: 9b6f42a79f85889cb6fb07465f92401ce1ca9bda38ad439010441c80fc29bde0
font_01_sfnt_off0000eb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 10960 bytes
SHA-256: 30407d1a884831006075a985ce3f2ff97bb6054a802b1ff9a2cbc0dfef9f5b3a

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