Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a0f927337203ef…

MALICIOUS

PDF

78.2 KB Created: 2021-04-25 13:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1026bec6d54ac7fc7e7861c0a37a11ee SHA-1: c7819d7cba5c7b0d665d2e41a044c86ad3482a51 SHA-256: 55a0f927337203efc7701c93cab06ec5d9e68b03ec88e0adfc796cf83d9a86bc
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or exploit kits. The primary attack pattern involves leveraging a deceptive document to drive traffic to a network of potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=what+needs+to+be+on+a+movie+poster PDF link annotation
    • http://zunidesejive.22web.org/57899685869.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/53140033034.pdfIn PDF document text
    • http://vozobatenaw.mywebcommunity.org/16961854101.pdfIn PDF document text
    • https://cdn.sqhk.co/gasosivifug/hjibnJL/527312819.pdfIn PDF document text
    • http://diluzadumavotux.getenjoyment.net/43919276611.pdfIn PDF document text
    • http://tokudujadi.medianewsonline.com/wepilawegenidigeguvefi.pdfIn PDF document text
    • http://widuzuduzudovix.iblogger.org/l_anatomie_du_cerveau_humain.pdfIn PDF document text
    • https://cdn.sqhk.co/mipijotom/b6hb46s/zombie_diary_2_evolution_hack_apk.pdfIn PDF document text
    • http://podifodosej.scienceontheweb.net/zelegonosunepibi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jewuvebasabam.rf.gd/come_on_eileen_sheet_music_flute.pdfIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_212714086e3c4760ba3cbf644296463b.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_56682f90ebf74b8bbafdbed23077f4cb.pdf?index=trueIn PDF document text
    • https://178fd8f3-986e-459b-a431-83c1f58eadb8.filesusr.com/ugd/7a8e82_bbe6024775f84add9848dde91278c864.pdf?index=trueIn PDF document text
    • http://gavawekib.myartsonline.com/how_far_apart_are_mens_hurdles.pdfIn PDF document text
    • https://1b6fe947-be7e-4494-9a94-f566f178d3d1.filesusr.com/ugd/89064d_ed4a744f24d64347bdaba07c1f22a180.pdf?index=trueIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_b97f89c8fae24c2b9226ebf3c882afa2.pdf?index=trueIn PDF document text
    • http://suwuriru.onlinewebshop.net/weapons_of_mass_destruction.pdfIn PDF document text
    • http://doroxokile.epizy.com/11278129129.pdfIn PDF document text
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_e4b0de1685634effac6d2f7464800924.pdf?index=trueIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_3b05a14201eb4cfbb4bf3c108238082a.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_off0000f20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20A 5380 bytes
SHA-256: 66e04159ebee2921845e68e8c6aea41133d221158511b0438b7eaa857b2000b4
font_01_sfnt_off00010433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10433 11564 bytes
SHA-256: 57d6e7458199570fb08ef95911b1eae605f2a9953ed688e85f882675ecdb1f97