Malicious PDF — malware analysis report

Static analysis result for SHA-256 5755dc9e81972fc4…

MALICIOUS

PDF

84.8 KB Created: 2021-03-23 03:53:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: ca52ab65156c3621483c3b7a7ffafcf7 SHA-1: 8c3842e0437f5d38612bffb59d856ed8cf3f416f SHA-256: 5755dc9e81972fc4728b612e0474ef6268937d51667fcc6df1d18500dec6bb5d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://ponafet.ru/aws?utm_term=how+to+stop+washing+machine+waste+pipe+leaking PDF link annotation
    • https://bopuxokefira.weebly.com/uploads/1/3/5/3/135300507/gigukekunuvamus-zoramuvokija.pdfIn PDF document text
    • https://penogefuf.weebly.com/uploads/1/3/2/7/132740618/b493a91e1.pdfIn PDF document text
    • https://sazavilekin.weebly.com/uploads/1/3/4/8/134851962/6185148.pdfIn PDF document text
    • http://wesifugutedif.iblogger.org/67231503441.pdfIn PDF document text
    • https://pujowuvorokom.weebly.com/uploads/1/3/5/3/135347933/5137675.pdfIn PDF document text
    • https://donagifiwududo.weebly.com/uploads/1/3/3/9/133985641/672252.pdfIn PDF document text
    • https://kakenemewaxe.weebly.com/uploads/1/3/4/6/134655752/b53fb9d597.pdfIn PDF document text
    • https://jogotipopawufi.weebly.com/uploads/1/3/0/7/130740597/1d9a5c24.pdfIn PDF document text
    • http://dozixolabizije.iblogger.org/vashikaran_mantra_in_telugu_free_download.pdfIn PDF document text
    • https://noragunefide.weebly.com/uploads/1/3/1/6/131637841/napowejofomif_lutotaxigure_zotixononu_wivetotejidoniw.pdfIn PDF document text
    • http://waxosasovan.22web.org/tuvix.pdfIn PDF document text
    • http://fulitip.iblogger.org/free_powerpoint_templates_for_business.pdfIn PDF document text
    • https://rezemofojo.weebly.com/uploads/1/3/5/3/135321986/nofobef.pdfIn PDF document text
    • https://bidefajiwi.weebly.com/uploads/1/3/4/0/134096082/9d8d38.pdfIn PDF document text
    • http://taxiralimivi.iblogger.org/forbidden_bookshelf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ae05ed-3f7c-42de-a6df-29a4076a516a/write_osi_and_tcp_ip_layers.pdfIn PDF document text
    • https://7d33af4c-acfd-4996-9436-348e89828b5b.filesusr.com/ugd/289672_196b455493934ba88447adc4bcb10243.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1163cb0-aa2b-49b7-97aa-421519a6c25d/geometry_dash_online_free_full_version.pdfIn PDF document text
    • http://zapofekeba.rf.gd/leckie_and_leckie_chemistry_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3849b05f-e415-45b9-8687-1e45247c5318/kijufujibuvesip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbeaee49-1190-4791-8244-da58a49d1057/husqvarna_372xp_max_bar_size.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_e194a76bf861482ab9df3c474bcd7651.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 5368 bytes
SHA-256: 7ddb8f7a75d8e30a1a57072210866b1fa852e09e32d578bcd961bac6b8dd1667
font_01_sfnt_off00010b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 10644 bytes
SHA-256: 5ba28fdb451fafe73ee7dba5face0f3f0e708da4dd6053dd8292f1455898fc2d
font_02_sfnt_off00012ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF2 16148 bytes
SHA-256: 333c6b7950143ef5b768b9d621755905cb9f9f437be433e332b6baa8edb2b5fd

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