Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3a9bf86b6af951b…

MALICIOUS

PDF

80.0 KB Created: 2021-03-28 01:46:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 545fba28ab91450c8b57e14ed6f4e7ac SHA-1: 808e1ce50ac7673ae0768ab5b3bd12dc1b341855 SHA-256: a3a9bf86b6af951bd0b8fb3044b5690b0b6962f745b894555bdd24edc719df22
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 link farm. The primary malicious URL, 'https://nipisod.ru/award?keyword=sociology+topics+pdf', suggests a phishing or SEO manipulation tactic. While no scripts were directly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=sociology+topics+pdf
    • http://rawenspant.online/wajotiboxebowolunapatvoamp.pdf
    • http://tidemelewofu.iblogger.org/adblock_plus_for_android_google_chrome.pdf
    • http://ourfanz.com/why_is_my_wireless_charger_blinking_yellowptoun.pdf
    • http://sokesiket.22web.org/coreldraw_x9_free_with_crack.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_d054bfdcee6747448ff6fa79f91633bc.pdf?index=true
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_f6ebd5b71ee2449aadab9e4ba2fe78a8.pdf?index=true
    • https://a134ef9b-a212-4d8e-a35f-da3d896bbd40.filesusr.com/ugd/dadc92_bdaadce5a0a4430894625a348e63d3bc.pdf?index=true
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_d66fe6b862694adab3fd4ee3e79e82ba.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3f891644-2a46-427e-8767-ca7dfe5db0d4/78818892133.pdf
    • http://kigetivizaru.epizy.com/acne_studios_sale_broadsheet.pdf
    • http://vutupaxuvidebif.rf.gd/wuzogujilirawizuzadipilot.pdf
    • https://69a7f268-727d-4112-ba4f-a3538cc856be.filesusr.com/ugd/9a0d60_486cafec10d649d0ac1d8b1953d3693a.pdf?index=true
    • http://mupisogedosido.epizy.com/xojamabusadubinumixaxavo.pdf
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_143e60d4275d493e9e4c4f60dae0e661.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cfd3b75b-529f-4093-81b4-e0377cb2e060/47728546997.pdf
    • https://uploads.strikinglycdn.com/files/48df6fd5-f824-48c9-b72f-91c998ec99da/it_infrastructure_engineer_interview_questions_and_answers.pdf
    • https://14e2190e-1c7c-401b-bdd1-4e50d95f8180.filesusr.com/ugd/62a579_d2b7305abd1f4f598ae3f0a77c921f16.pdf?index=true
    • https://911f1565-2faa-4874-b261-330d521e7362.filesusr.com/ugd/f46427_11ebeb1cbcea431881b3df23fbbc3de7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8842ffcf-e97c-47dc-832d-245a743fb24a/doxevulenopesidemizebate.pdf
    • https://uploads.strikinglycdn.com/files/38069b33-0285-4153-a2a4-408d41c04a27/what_does_the_ending_of_persepolis_mean.pdf
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_235369135fc8485e9044c58fbbfddc21.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_off0000fd90.bin
86b4694940b459628a56f9ced2aa23815f8253f330a66274dc44e1c936309f0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD90 5224 bytes
font_01_sfnt_off00010f7a.bin
cf52d26b9c2d618fb397dd35d2fbca3ee80abc5c17a8c60e707805011158ad06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7A 10340 bytes

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