Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43639ca304f1acf…

MALICIOUS

PDF

74.9 KB Created: 2021-05-08 09:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8e2a5be3608f74765e7c1a792e06c179 SHA-1: 684f49eb7f97218565e38dd209137711ead390b0 SHA-256: c43639ca304f1acf445d07001061685a318c982e4b18c7a504eacec1be5ab6b7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URL points to a domain associated with phishing or malware distribution, likely intended to redirect the user to a malicious site.

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
  • 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.
  • 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://gimoguvi.ru/strik?utm_term=how+to+clean+tankless+water+heater+filter PDF link annotation
    • http://pubgmobiie.com/pharmacology_an_introduction_6th_edifwqe2.pdfIn PDF document text
    • https://tazanuna.weebly.com/uploads/1/3/5/9/135977230/keraj-begit.pdfIn PDF document text
    • http://fonudesuwobulud.mygamesonline.org/88460983473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_601e252ce318c.pdfIn PDF document text
    • http://it50save.info/ivan_pavlov_experimento5jym4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420037/normal_60379c2127cbc.pdfIn PDF document text
    • http://vanimerukaguto.scienceontheweb.net/axiomas_de_zurique_gratis.pdfIn PDF document text
    • https://polatoni.weebly.com/uploads/1/3/1/3/131379392/guvomeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403407/normal_603e99ffa91ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_603b45ec8a513.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408197/normal_5ffd7caad3d35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479933/normal_6031e889e831e.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/what_is_future_generali_life_insurance.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/yanda_kartavya_aahe_marathi_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/betege.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/does_netflix_have_in_the_heart_of_the_sea.pdfIn PDF document text
    • http://satogitexuvo.myartsonline.com/fikakapapizowidebakagofed.pdfIn PDF document text
    • https://s3.amazonaws.com/wavunot/84831184424.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/hp_pavilion_dv6_windows_10_drivers.pdfIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/computer_networking_free_download.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_off0000e6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F1 5084 bytes
SHA-256: 373903b3ea5dae257f527e8dc58ef9c92ef9cc8544a83500fe7e8ba4ecb3d164
font_01_sfnt_off0000f84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF84B 11136 bytes
SHA-256: 21433f166d06c3753a8fd46ace3102b6a2a35c606630124026d200261285d4b6

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