Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a5941cf588b29e…

MALICIOUS

PDF

77.9 KB Created: 2021-03-08 15:05:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f08ea727fea614752829e79979f3ae8d SHA-1: 9f458b13c0029cf15d5990e9449116615722ee2e SHA-256: 87a5941cf588b29ee27aded12dd259aa33ea8cf0330046b343cc5f851bb5bf7f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be related to a 'background remover' tool, likely a lure to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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 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://xezojetit.ru/123?utm_term=background+remover+for+pc+free
    • https://static.s123-cdn-static.com/uploads/4385633/normal_5fe594fbb5c1b.pdf
    • https://static.s123-cdn-static.com/uploads/4473642/normal_5feb6314b76e1.pdf
    • https://cdn-cms.f-static.net/uploads/4451356/normal_602fdb007957b.pdf
    • http://cmbespaceclient.xyz/nozinazuwose7itt7.pdf
    • https://vupimovijuxupef.weebly.com/uploads/1/3/4/3/134354147/fb0c49fe51b.pdf
    • http://4d-5d.com/rorenazariwuvuzasuxo3a2qe.pdf
    • https://lekopejener.weebly.com/uploads/1/3/5/3/135323345/xalimudidizigi-dufuw-kiderabupuxete.pdf
    • https://cdn-cms.f-static.net/uploads/4490720/normal_602c12171d0bb.pdf
    • http://spainsale.pro/waving_through_a_window_drum_sheet_musicvdfys.pdf
    • http://moneyindia.site/94458965896kbjef.pdf
    • https://static.s123-cdn-static.com/uploads/4402252/normal_5ff3bc2048967.pdf
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/9affb5.pdf
    • http://sale50.pro/mk_prestige_dado_trunking_data_sheettgukw.pdf
    • https://xiwupezarevapo.weebly.com/uploads/1/3/2/6/132681984/ae10f5f9.pdf
    • http://helplnstagramoffice.com/schwinn_stationary_biken9srk.pdf
    • https://jumosoguwakebak.weebly.com/uploads/1/3/4/5/134588816/2465816.pdf
    • http://bostpolamos.site/9288765952xhnvj.pdf
    • https://static.s123-cdn-static.com/uploads/4367305/normal_6009ac4f3f277.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_dd42f739a8c8474b938735e309bb9d35.pdf?index=true
    • https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_b8ed143a544644269dbd56cfc997f7fe.pdf?index=true
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_1e316a0fc6e64b5c9dbf066ae3258df3.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fe.bin
32d2c8ae3367725d1586f2a8deeecfa1c296fd9bc3e3949a49c68169b5970c56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 5440 bytes
font_01_sfnt_off0001067c.bin
3ba150db2f6aff2869d6ed34557d25dd2757a8f9b92c354e29cd9878882aed01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 10580 bytes

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