Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd627d1076681e8…

MALICIOUS

PDF

72.3 KB Created: 2021-06-01 19:39:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0e0bbc0288d7fdb2ea448626fc86f6bc SHA-1: 7151ee7b5ad23675de8e837015aaa939ae2e6d65 SHA-256: 0cd627d1076681e8a8d38a2e1f8f070e3c5be4860f6da2444657855a1e9ae032
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://infrive.ru/pbw?utm_term=what+is+strategic+positioning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414332/normal_606b30707b357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_600e3e2d31167.pdfIn PDF document text
    • https://pibofarijefi.weebly.com/uploads/1/3/4/6/134648305/6625863.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388613/normal_5fcd518b1414e.pdfIn PDF document text
    • https://siwuluwavati.weebly.com/uploads/1/3/4/7/134756127/ff02c0582.pdfIn PDF document text
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/95ba822d2f271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_5fd1226cab763.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_60359a944539c.pdfIn PDF document text
    • https://boralixaki.weebly.com/uploads/1/3/4/4/134479476/1ba166bcb.pdfIn PDF document text
    • https://dawozonejuveru.weebly.com/uploads/1/3/4/4/134489779/mupodopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_604e925313a83.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/jegudas_luwivapo_xupasogituke_lukewivejiv.pdfIn PDF document text
    • https://zanonolupurezo.weebly.com/uploads/1/3/3/9/133997165/1373078.pdfIn PDF document text
    • https://katutufoderosut.weebly.com/uploads/1/3/1/4/131437544/9088414.pdfIn PDF document text
    • https://zedebofewel.weebly.com/uploads/1/3/4/5/134594015/4844621.pdfIn PDF document text
    • https://lififamofupuge.weebly.com/uploads/1/3/4/3/134317858/8175320.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496013/normal_60438d21c5aa8.pdfIn PDF document text
    • https://repemokalit.weebly.com/uploads/1/3/1/8/131856723/tolezebudemasijuzuwi.pdfIn PDF document text
    • https://tedaliduvif.weebly.com/uploads/1/3/5/9/135957254/990214bfe21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410414/normal_5ffdb0f20d7e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417413/normal_5fc576cc6a1c9.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/a45c1af8-fd76-4a51-b40a-93a42c069427/how_to_read_financial_statements_warren_buffett.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad64fc04-18bb-4d21-8c8e-dcfbe955ab01/dirt_devil_stick_vacuum_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11440916-5152-4622-8c7a-790f40ec24f4/how_to_adjust_bipap_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd449591-81e4-47f9-924d-b42d927dbe9d/whirlpool_front_load_washer_error_code_e1_f3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a8540ce-eb93-424c-b264-bf7505c1a0f9/essentials_of_anatomy_and_physiology_6th_edition_answer_key.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_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 5176 bytes
SHA-256: b33b9d90e4be05c69be257fa12db0f556b437e9b078031f7f41373216d452b52
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 10244 bytes
SHA-256: 8cfceefd36ff659c9b61fd06c9f282fb60e36c4e9566b1b8f86bc07009dc8804