Malicious PDF — malware analysis report

Static analysis result for SHA-256 4840405893e36ce2…

MALICIOUS

PDF

76.2 KB Created: 2021-04-29 11:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4da6b30cf9dbe667723387165a75e9ef SHA-1: 7db5c27124dce6e3d5bb4d2db06edb5fa749f686 SHA-256: 4840405893e36ce24a3bb576a0db19490bdd9eb28c8c623b3cd36bcf2251d091
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 to SEO-optimized PDF documents, suggesting a link farm or content-scraping operation. One of the primary external links, 'https://resalured.ru/strik?utm_term=at+what+age+do+dachshunds+go+blind', is presented in a way that mimics a search result, indicating a likely lure for users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/strik?utm_term=at+what+age+do+dachshunds+go+blind
    • http://hristogrigorov.com/navien_tankless_water_heater_instruction_manualze911.pdf
    • http://runaxok.iblogger.org/buvurikikusugofo.pdf
    • http://kpupnov.pro/sifulejc6na.pdf
    • http://mekomob.getenjoyment.net/algebra_de_boole_libro.pdf
    • http://gagitevanonuti.mywebcommunity.org/traducir_de_espaol_a_latn_clsico.pdf
    • http://jafujofefi.iblogger.org/applied_science_diploma_2nd_sem_notes.pdf
    • http://gaxesujite.medianewsonline.com/modern_refrigeration_and_air_conditioning_18th_edition_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kudefem/porukojidurilod.pdf
    • https://s3.amazonaws.com/bidurudilidujug/newolebenegasetepaziwaken.pdf
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_91ccb6d084b34ef0818422c06b4a6c41.pdf?index=true
    • http://pujumek.myartsonline.com/xiwutegafopa.pdf
    • https://s3.amazonaws.com/waduzirader/how_do_i_tell_what_year_my_john_deere_is.pdf
    • https://s3.amazonaws.com/nokiva/8784204539.pdf
    • http://faxunarin.epizy.com/determiners_year_4_worksheet.pdf
    • https://s3.amazonaws.com/pevarijidasalop/bradesco_net_empresa.pdf
    • https://s3.amazonaws.com/dozore/vijopunexoli.pdf
    • https://s3.amazonaws.com/rivazixexuguri/birthday_images_for_boyfriend_free.pdf
    • https://s3.amazonaws.com/fewunadupop/naderazasezulijuvowuzuk.pdf
    • https://s3.amazonaws.com/zabevog/minn_kota_i-pilot_replacement_remote_control.pdf
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_26040992abeb4ffe8bcf2163ec9e0580.pdf?index=true
    • https://f3dbd103-cf2f-44fc-b0ad-c9004dc38af2.filesusr.com/ugd/1f2646_4237c83ef48042f88bb3a19a18bc4786.pdf?index=true
    • https://s3.amazonaws.com/jemazejodep/46714834427.pdf
    • http://tadukaxuzevida.epizy.com/how_to_reset_genie_mini_remote.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecfa.bin
9977e247101193176ec7676995c347a2eead9d44fff40a85dd90304d582a1a63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 5324 bytes
font_01_sfnt_off0000ff2b.bin
abd846d509e461db739f340289908b70c39684f58cc7a6500e985653d11fc439		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 10676 bytes

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