Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4de552433fdd596…

MALICIOUS

PDF

81.1 KB Created: 2021-04-01 18:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 817cecf96f52452257afaad1ebf3d754 SHA-1: 1d79204f2dab4de126bfaedd4dc978f757e0370b SHA-256: d4de552433fdd5965f1c93c533e5ee9c7ea4060ea4ecc296b93e621cc57a7dd5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary external URIs, 'https://xezojetit.ru/award?keyword=coleoptera+scarabaeidae+pdf', suggests a deceptive attempt to attract users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/award?keyword=coleoptera+scarabaeidae+pdf
    • https://static.s123-cdn-static.com/uploads/4451755/normal_5ffbd0fd3f03d.pdf
    • https://static.s123-cdn-static.com/uploads/4464525/normal_5fca44e78017e.pdf
    • https://cdn-cms.f-static.net/uploads/4475864/normal_602111c7c779f.pdf
    • https://cdn-cms.f-static.net/uploads/4386842/normal_6026210c2ce7e.pdf
    • https://static.s123-cdn-static.com/uploads/4499636/normal_5ff9b07fd6b98.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_0242ab1227bc48dc90e026a229e8b5f5.pdf?index=true
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_2439a55a54dc4308a8365dd28fb3f34a.pdf?index=true
    • https://s3.amazonaws.com/ninasivol/man_utd_game_report.pdf
    • https://s3.amazonaws.com/lunojol/65486125707.pdf
    • https://s3.amazonaws.com/wujafivabipo/morenudabi.pdf
    • http://voxinakono.rf.gd/cavatina_john_williams.pdf
    • http://kojexeruxub.epizy.com/fabaxitusujasomibakaxesus.pdf
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_32a47c35678d4ab4a3d09d548fc2ba09.pdf?index=true
    • https://s3.amazonaws.com/bikikanafopavu/demande_allocation_chomage_pole_emploi.pdf
    • http://lexawelezalum.epizy.com/extent_report_testng_selenium.pdf
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_4b901ed5007141a0951c34db4ec384d4.pdf?index=true
    • https://e18e6c05-101e-4f41-9c4d-f518aea09dbb.filesusr.com/ugd/7972b3_c1abd1c501184feb9c641ccd8048c3f0.pdf?index=true
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_d8a2656fe5374c82b47160caf210b56a.pdf?index=true
    • https://s3.amazonaws.com/tetofamuxulil/alibaba_story_video.pdf
    • https://f27bca7f-571c-471d-9e77-92385e6dfcd0.filesusr.com/ugd/9a0fa1_b67fa86ac56d4b51b31f1c0abe19bf4a.pdf?index=true
    • http://tesoxukezeziles.epizy.com/42790907822.pdf
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_a880f2f6516841a5ad9c9c84b2721cff.pdf?index=true
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_4604595f5e834b29a1b4708c179f560a.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_off0000ff62.bin
7d672a4eacb89de2aa63177bb7052480a01dfc9ee7c07efe1367134c32b8f0f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 5196 bytes
font_01_sfnt_off0001110c.bin
f732189fb5319b9d241a9e5ae31dde8b5eb02590d535a929c1699c1695375e0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1110C 11540 bytes

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