Malicious PDF — malware analysis report

Static analysis result for SHA-256 99361261d5b74fae…

MALICIOUS

PDF

65.2 KB Created: 2021-03-11 05:19:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 97e9c0cf869f9b5d2587e3d3dfb73d33 SHA-1: 028780d0f32f861d76dd89ae6034c12077636459 SHA-256: 99361261d5b74faea55b3cb22e07f09ba6994e20118592d3270b05ec825a5f18
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or redirection attempt. The ML classifier and ClamAV detection further support the malicious nature of this file, likely serving as a lure to a phishing site or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=excipient+gmp+guideline In PDF document text
    • https://static.s123-cdn-static.com/uploads/4385417/normal_60061e32d8493.pdfIn PDF document text
    • http://wigageturuv.mywebcommunity.org/10053711860.pdfIn PDF document text
    • https://sapigufebo.weebly.com/uploads/1/3/4/5/134592603/b24ad0235b8.pdfIn PDF document text
    • https://cdn.sqhk.co/tevunufoba/chgiJfK/3rd_rock_from_the_sun_3d_glasses.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459029/normal_6041a433ef333.pdfIn PDF document text
    • https://losopaxirusegu.weebly.com/uploads/1/3/0/8/130813120/241638fc.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/iahcojf/tips_fantasy_premier_league_gameweek_4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421038/normal_6041f3b70c871.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387701/normal_6014e6d19eb8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382948/normal_6010c7364ab21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370071/normal_601a7da605982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_600a766deb0f5.pdfIn PDF document text
    • http://tifoxikutawe.sportsontheweb.net/42344905687.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/1gfThdM/flights_to_miami_florida_from_detroit_michigan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wunipowozat.rf.gd/vefazebufedubi.pdfIn PDF document text
    • http://duwawadava.rf.gd/pentair_intellichlor_ic20_for_sale.pdfIn PDF document text
    • http://zimemotom.rf.gd/phpspreadsheet_convert_csv_to_xlsx.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/zapubajipoza.pdfIn PDF document text
    • http://pababevo.epizy.com/world_8_ball_pool_rules.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_off0000c63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC63B 4932 bytes
SHA-256: 0a4ca5d0e736be307b8a59432e6e049a8c7137448ec53dd4960d7c1625a9808d
font_01_sfnt_off0000d701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD701 9568 bytes
SHA-256: 3c051d66237ea2439e565f371dc3fa032d1e0b11578fcb9dda68906710c549f7

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