Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94b24ae022b577d…

MALICIOUS

PDF

100.3 KB Created: 2021-02-21 20:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f22d209567a85fb0b7b5442b11160a10 SHA-1: 5193862acfdbdfd72761e8b5beb92e04565cf12c SHA-256: c94b24ae022b577d9087ef0d24c08097db66ddff09a20ee679bf3a0efd3f2516
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. Additionally, it hosts a PDF link farm, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://yafferge.ru/strik?utm_term=sex+education+season+2+episodes+list In PDF document text
    • https://dapunilak.weebly.com/uploads/1/3/4/5/134506399/7198126.pdfIn PDF document text
    • https://xuvurabog.weebly.com/uploads/1/3/2/6/132696285/kaxibifob.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446507/normal_5fca693ead519.pdfIn PDF document text
    • https://cdn.sqhk.co/tiruxugajo/GjjtVXk/lajumelikumopilekek.pdfIn PDF document text
    • https://cdn.sqhk.co/mobirewin/aggiejc/24693967043.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/M1ij4ib/gravity_trampoline_fountain_park_edinburgh.pdfIn PDF document text
    • https://viwutexotopuj.weebly.com/uploads/1/3/4/5/134522905/nogeramimaje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gifazewuki.epizy.com/difference_between_viral_and_bacterial_throat_infection.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/whirlpool_cabrio_dryer_wont_power_on.pdfIn PDF document text
    • http://zepibugab.rf.gd/logoxafofagatejebu.pdfIn PDF document text
    • http://zapumodexajo.rf.gd/anamnesis_fisioterapia_formato.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/best_audio_file_format_converter_software.pdfIn PDF document text
    • http://xegutosedon.rf.gd/37873804736.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/steelers_week_8_injury_report.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/cornerstone_hillsong_sheet_music.pdfIn PDF document text
    • http://januxalak.rf.gd/personal_possessive_and_demonstrative_pronouns_worksheets.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_off00014b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8B 5276 bytes
SHA-256: 99ecea1d6e1204eee11a1fad1d13d833ff5ccfd8ab04a21e328b4909e4ed5bf9
font_01_sfnt_off00015d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9A 11276 bytes
SHA-256: 1fcdc49329b075de32dc0dd22e8d8f633119f7633dd18f48aa64f2550ff01bc3

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