Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68cdb98e7a07874…

MALICIOUS

PDF

87.8 KB Created: 2021-03-23 22:23:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2315b1a15b9b8fc5ed8aecd9c4c66740 SHA-1: aa65de053f9c3002011237c460bd6218ec8a1a49 SHA-256: f68cdb98e7a078744879b35473ba2cd6489459f9179510bfefccc19fa1ce3021
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is detected as malicious by ClamAV and an ML classifier. The primary URL, https://ponafet.ru/wix?keyword=zenith+tv+vcr+combo+manual, suggests a lure to a potentially malicious site. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to redirect users to external content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • 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
  • 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/wix?keyword=zenith+tv+vcr+combo+manual
    • https://cdn-cms.f-static.net/uploads/4481684/normal_6028947ff34f4.pdf
    • https://static.s123-cdn-static.com/uploads/4479436/normal_5ffe0209b7514.pdf
    • https://cdn-cms.f-static.net/uploads/4489415/normal_601d931703f0a.pdf
    • https://cdn.sqhk.co/fadejiweruw/hWhiijc/emoji_puzzle_game_download_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4495246/normal_6045fbb807cf8.pdf
    • https://static.s123-cdn-static.com/uploads/4372673/normal_5ffa7fa6466f1.pdf
    • https://cdn-cms.f-static.net/uploads/4382773/normal_600b9630a01fb.pdf
    • http://wuvutax.iblogger.org/bagewerizimoginokotidagi.pdf
    • https://cdn.sqhk.co/nawiwola/ibjb4id/meziwenimewunezevu.pdf
    • https://static.s123-cdn-static.com/uploads/4416151/normal_5ff977cf51fe7.pdf
    • https://cdn.sqhk.co/vixukose/3n8LwDT/17607617547.pdf
    • http://pumujavebedopa.iblogger.org/xulubibujikulowupi.pdf
    • https://cdn-cms.f-static.net/uploads/4446781/normal_6053b6fdb1989.pdf
    • https://cdn-cms.f-static.net/uploads/4448733/normal_603416c7c2bb2.pdf
    • https://cdn-cms.f-static.net/uploads/4402938/normal_60134b812860e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_fc0f214331964424b632fc3fd99e82ff.pdf?index=true
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_44173ef1054a4acebf4dae2d137b29b3.pdf?index=true
    • https://ed457e25-7262-4bf7-b769-9a3df1da8a49.filesusr.com/ugd/60ac0c_8cac4e8aa89545e0bc0e9c027d57d6e1.pdf?index=true
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_0b1d917cf6c44111b57b3c22c363def7.pdf?index=true
    • http://jogalasevoron.epizy.com/tensile_test_report_for_brass.pdf
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_b4842bcb4eeb4f8485d190bbee20047b.pdf?index=true
    • http://zexizel.epizy.com/95752938266.pdf
    • https://679cd94f-bb1f-411a-9684-d99498fe93d6.filesusr.com/ugd/ce16d4_579e5814702d427ca9dc7fe354d283ae.pdf?index=true
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_9f56ff650fa449518d2234e68abb21f4.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bc4.bin
af0f7fa89ade733bc4fa63646dd58f5725676f932c3d14e13e0c659a728e30bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC4 4900 bytes
font_01_sfnt_off00011c3f.bin
027a3c1905f29c1100400f99a4338b09ded4e6395b0d5188e23efadf452b20de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3F 11796 bytes
font_02_sfnt_off000143df.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143DF 4324 bytes

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