Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81093b4f6ef12a0…

MALICIOUS

PDF

91.0 KB Created: 2021-03-30 00:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3400b73061828c227da043cdb5c3919 SHA-1: 77dcc4526cb95b93e69fa37371a8ab17553d614b SHA-256: b81093b4f6ef12a020d3dbb4efa5e1e3d1f00068e4431b47e202141415f5077b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the presence of a link farm with numerous external URIs, including one pointing to 'nipisod.ru'. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest it is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://nipisod.ru/wix?keyword=green+sturgeon+habitat
    • https://static.s123-cdn-static.com/uploads/4492600/normal_5fcdcc590e7a8.pdf
    • https://cdn-cms.f-static.net/uploads/4368249/normal_60412baed94a3.pdf
    • http://fejugutafilevin.scienceontheweb.net/denoferozo.pdf
    • https://static.s123-cdn-static.com/uploads/4481164/normal_5fedc775735da.pdf
    • https://cdn-cms.f-static.net/uploads/4421473/normal_600f3345553de.pdf
    • http://jovasetiveduza.scienceontheweb.net/87903196515.pdf
    • https://static.s123-cdn-static.com/uploads/4369643/normal_5feb9877e8a2e.pdf
    • http://jaxagogilexet.sportsontheweb.net/traitement_sinusite_chronique.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bupaxomu/80805547062.pdf
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_816b6b96c6b243a3b921ca031a0c3ad7.pdf?index=true
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_f18c85326a5f47989a881c91ce8de153.pdf?index=true
    • https://s3.amazonaws.com/wexoteluwag/16180119669.pdf
    • https://s3.amazonaws.com/sifawekujiki/jesojirofexemupeku.pdf
    • https://s3.amazonaws.com/wupuxus/xenulerifepomugadafow.pdf
    • https://s3.amazonaws.com/jexijer/xaperafinilelolaluwer.pdf
    • https://s3.amazonaws.com/nojemi/japiwet.pdf
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_5e250d0e9a794e2a85aac65db0379284.pdf?index=true
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_0d5b133892c64b61ab5c9a48dc00c29e.pdf?index=true
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_6ba67548a89841528bff5dc62c64cd39.pdf?index=true
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_ac8adf9a81bd44809bd2483e97708e70.pdf?index=true
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_c119f1ef40904b9683ebf6b9fa098bd9.pdf?index=true
    • https://s3.amazonaws.com/zevutebulaworel/what_is_broadcast_receiver_android.pdf
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_6b738e6b7f384673a76bd91ba7fa2fce.pdf?index=true
    • https://s3.amazonaws.com/fosawef/ls2208_specification_sheet.pdf
    • https://s3.amazonaws.com/bidurudilidujug/ladubi.pdf
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_c5eb3aae9d0f4421beb5823b73d0fac6.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_off00012532.bin
3ee27eebd21d048046b419683976aea2c462234eb23f96b51bf2b8921bdda254		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12532 5088 bytes
font_01_sfnt_off0001367a.bin
0a15c11d125abeb601809f7eedf3560587aa01589c6c28841d2b58f90f3c58b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1367A 11364 bytes

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