Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eab21f6639bc2b6…

MALICIOUS

PDF

69.5 KB Created: 2021-03-09 12:14:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7da7b501ee9eb04b8b221b65592c3b6 SHA-1: 73cf07f922e466cbe90960aeaa4d55624ae6b032 SHA-256: 9eab21f6639bc2b664d27eab1c1768edf29464e68c5a400c98c41495e516ceb8
154 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one pointing to a suspicious domain ('nipisod.ru') that is flagged as unknown reputation. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to create a link farm for SEO manipulation or to host malicious content. ClamAV detection and ML classification further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8224

Heuristics 4

  • 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
  • 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=our+casuarina+tree+analysis+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6931c704-302f-4919-a523-d819aa8ad17b/vurifaluxerux.pdf
    • https://uploads.strikinglycdn.com/files/2cdf95cb-eac9-4dfa-b715-04ab0774bbbc/dugemababiwadimida.pdf
    • https://uploads.strikinglycdn.com/files/0e7c2850-3e29-446d-8862-72e8fc5e0591/pharmacology_calculations_made_easy.pdf
    • http://kezatafoxab.epizy.com/95526977395.pdf
    • https://uploads.strikinglycdn.com/files/6ddc8371-f233-4bd3-ac0d-a09b4098b1bb/the_boy_in_the_striped_pyjamas_film_characters.pdf
    • https://uploads.strikinglycdn.com/files/1850083f-9309-46c5-b955-f041b4954605/el_hobbit_1_2_3.pdf
    • http://nowuzapifara.rf.gd/40271075166.pdf
    • https://uploads.strikinglycdn.com/files/7e1ecb56-f598-4f30-9b70-ff10c16fd938/how_to_test_the_amperage_of_a_battery.pdf
    • https://uploads.strikinglycdn.com/files/4efaf58e-ee28-43ba-9dfb-f7b57f4f13ac/which_is_better_software_or_mechanical_engineering.pdf
    • https://uploads.strikinglycdn.com/files/2c16e43e-6f28-4aa9-998b-040368fa618c/73968108602.pdf
    • https://uploads.strikinglycdn.com/files/738ab1f3-081a-41f8-86e1-a0cac6e53026/jay_z_decoded.pdf
    • http://kenasaxoxaxober.rf.gd/76968882455.pdf
    • http://posinumufupe.epizy.com/xiluvitenupujipo.pdf
    • https://uploads.strikinglycdn.com/files/dd937d92-7246-43a3-9f03-9319e2c46785/computer_systems_analyst_salary_los_angeles.pdf
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_03a4817ecc124eb1966dd5f682fa090e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4662007f-1d09-4c3b-be62-985ebe59bfe0/samsung_powerfoam_vrt_top_load_washer_manual.pdf
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_c67bf15b7feb48688643f114146f4f07.pdf?index=true
    • http://gisoroxirofusup.epizy.com/accidente_riesgo_biologico.pdf
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_2ae9b1add68f4feda97e1142966ef4b1.pdf?index=true
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_21499e035b3e47a59487ee5cd520e034.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e438.bin
e6cad5add64418f326c5dc08ca01703d0c74bddfcaec03ce7c01b85cbfb9db0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 5276 bytes
font_01_sfnt_off0000f63d.bin
c2606bf3780b31d3a9c99b37d07b7f9f32373238b9c6ff0fd70cdc257aca05ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 10240 bytes

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