Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c1e430d9b39a99…

MALICIOUS

PDF

77.4 KB Created: 2021-04-29 02:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b503e5747758afb69ceb70f422e55b7d SHA-1: 041237ded4785fdcdcffdd979cab9b8bf2213f37 SHA-256: e1c1e430d9b39a992c95403ed26550dd9741c61b81a8457546b99a046c55d5ad
184 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic identifying it as a malicious redirector pointing to 'https://yafferge.ru/strik?utm_term=asus+rt-ac68u+router+reset'. The document body, though heavily obfuscated, appears to contain keywords related to router resets, suggesting a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=asus+rt-ac68u+router+reset In PDF document text
    • https://cdn-cms.f-static.net/uploads/4481053/normal_5fd5f27d74f3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379384/normal_5ff659ab2c048.pdfIn PDF document text
    • http://tuzogat.sportsontheweb.net/blender_2._78_tutorial_for_beginners.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://psychologyrelax.xyz/mawibofolifejebitubotoe48ds.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383923/normal_5feba4637a693.pdfIn PDF document text
    • http://kernig.store/tobawugoberivuxebu01nz8.pdfIn PDF document text
    • http://repair-planshetov.ru/raruferamurolunavuzawuvws7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464532/normal_5fe317b063b4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496812/normal_6043da653dacb.pdfIn PDF document text
    • https://cdn.sqhk.co/bidogefapo/9Bigigq/barber_shop_simulator_3d_mod_apk_unlimited_money.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/cables_and_wires_nptel.pdfIn PDF document text
    • https://cdn.sqhk.co/lasumalena/iiNyhhH/98561318498.pdfIn PDF document text
    • http://dikoxikikalonib.scienceontheweb.net/vedijunafilikag.pdfIn PDF document text
    • http://tohld.in/george_foreman_jr_rotisserie_parts0793q.pdfIn PDF document text
    • https://cdn.sqhk.co/femokuxajuz/jhm3ifl/nejitixedukug.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/1ggnytP/wojagetejerazewizoxubepop.pdfIn PDF document text
    • http://natbeach.space/ssc_mcq_answer_sheetbelwj.pdfIn PDF document text
    • http://jakiduve.scienceontheweb.net/19834429253.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/be2f8feb-bb61-4ebc-813b-798d1a86754f/miwatomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0afd788-5de3-49eb-a70f-3b6757aac8bc/ti-83_plus_calculator_online_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf63afc-9ca6-4be4-86cc-7726051692ce/bobitonapukefovivubuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35dd53f9-96e1-4354-a33f-14e75ba056b3/samsung_grand_prime_frp_unlock.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/29780483525.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_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 5128 bytes
SHA-256: 424305459ed6459ead7558a4acc00c07796ddda8b81c7d9a13b1987e961f6311
font_01_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 10792 bytes
SHA-256: a0843da5bf513b1ff62c5723787ccabbf2b07a16048bc501671c0705f8494a62