Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f64bb1a938e3cc…

MALICIOUS

PDF

76.3 KB Created: 2021-03-23 02:55:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6538c00854d9dd91100209935cbc4da8 SHA-1: 5a4d688cda08cf9b8a14f1e4c83acce3f3606a7a SHA-256: e6f64bb1a938e3cc3387fdc8db6c3122837103c2e47c66379a6cc071528d2f25
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or link farm attempt. The document body, though heavily obfuscated, contains text related to 'jump rope gym benefits' and 'wkhtmltopdf', likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/strik?utm_term=jump+rope+gym+benefits PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4493578/normal_602fea97f3b0e.pdfIn PDF document text
    • https://cdn.sqhk.co/xororasomig/ggjfeBr/43468622833.pdfIn PDF document text
    • http://fumizudo.sportsontheweb.net/hebrew_dictionary_audio_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/gusoguribus/jdqZZgc/8560864474.pdfIn PDF document text
    • http://ketaton.mywebcommunity.org/types_of_attachment_styles.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421336/normal_601b311b601a6.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/advanced_cost_and_management_accounting_notes.pdfIn PDF document text
    • http://wativeb.mypressonline.com/algorithm_and_flowchart_book.pdfIn PDF document text
    • http://zosuwalerikare.getenjoyment.net/blanchard_and_fischer_lectures_on_macroeconomics.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/hcjdzjb/vumuboriluzumiweranelore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445129/normal_604fecd72c3c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_604a64623d571.pdfIn PDF document text
    • http://paselon.getenjoyment.net/against_the_grain_james_c_scott_audiobook.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_6a52c3492b0149c9bd95837ddbd580fd.pdf?index=trueIn PDF document text
    • http://jogakedom.epizy.com/76007796943.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/duwigupawosufagomexubunof.pdfIn PDF document text
    • http://lelesajik.epizy.com/hip_hop_drum_beats_free_download.pdfIn PDF document text
    • http://kopunumepoz.rf.gd/fufagituzujejelatime.pdfIn PDF document text
    • https://cdb53ace-3f3f-41e1-823e-0ecf3add8ba2.filesusr.com/ugd/47e9e0_fdf2a685c00449a5ae5470f05d4664d9.pdf?index=trueIn PDF document text
    • http://mozaninukokefef.onlinewebshop.net/nutekamileveta.pdfIn PDF document text
    • http://wegepuzil.epizy.com/family_trust_deed_template_south_africa.pdfIn PDF document text
    • https://ac09d6fb-20d1-47e2-97cb-2568fc137cdf.filesusr.com/ugd/03dcd4_12bf528b9dc54d64b77be136de151408.pdf?index=trueIn PDF document text
    • https://77a5c3e7-429a-4f60-ad30-886abaef4f6e.filesusr.com/ugd/07a1ab_65ba766c32d4464d9c0365dc725a0323.pdf?index=trueIn 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_off0000eec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC7 5212 bytes
SHA-256: 67bab8999a0b8573d5c8e6f6e139ad07a28bdd1c455f38415d43810c7914eedf
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 10364 bytes
SHA-256: 8a14409f990a748eabc6ea6a1f6d5e1c3a4aad59c98dcac89337eb72df765b61

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