Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc90fc79d0fe709…

MALICIOUS

PDF

68.3 KB Created: 2021-02-15 09:15:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cd9b31f3d8a96681de2f460f83de96bd SHA-1: ab805755acd5c269f01d7e999ecbe063395f0168 SHA-256: 8fc90fc79d0fe709da13b9b87c8ef0a154c15d365a25de3e62dc78eadd32c255
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it's designed to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

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 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.
  • 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://leonvi.ru/strik?utm_term=bounce+back+little+mix+lyrics+youtube PDF link annotation
    • http://help-service-support.com/vicks_ultrasonic_humidifier_manualujlsp.pdfIn PDF document text
    • http://kaxidabifibag.iblogger.org/gojipun.pdfIn PDF document text
    • http://derewopenila.22web.org/bearded_dragon_petco_care_sheet.pdfIn PDF document text
    • https://terenedadobi.weebly.com/uploads/1/3/5/9/135961601/pitomasababuja.pdfIn PDF document text
    • https://xafovudomogagak.weebly.com/uploads/1/3/5/3/135324285/7614341.pdfIn PDF document text
    • https://sasanufodokedu.weebly.com/uploads/1/3/0/9/130969760/sabujinupabuwetokilu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413735/normal_600301e4e2f72.pdfIn PDF document text
    • https://tizemafuniture.weebly.com/uploads/1/3/4/6/134636649/3124640.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457008/normal_5fe010255a3f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470552/normal_60276678220b3.pdfIn PDF document text
    • https://vopifubuk.weebly.com/uploads/1/3/1/6/131636719/1766080.pdfIn PDF document text
    • https://memelixuluxowi.weebly.com/uploads/1/3/5/9/135958522/1176676.pdfIn PDF document text
    • http://bizbize-yeteriz.org/4126139516cydjj.pdfIn PDF document text
    • http://heleogose.online/bcbs_federal_pre_authorization_formks83i.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/6423000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379355/normal_602577da058d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://riwexakax.epizy.com/angry_birds_transformers_gem_generator.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_off0000d087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD087 5368 bytes
SHA-256: e3060c37466fbefa709d4f1208d1de2b49b24e5be27053cb791c4383a783f8f0
font_01_sfnt_off0000e2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 9840 bytes
SHA-256: 6375ce0c3f98a7b9e4944d19b416d076af3c1f4c8843d1b3adf4b9d199c7b12c

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