Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c955f4874ce283…

MALICIOUS

PDF

95.4 KB Created: 2021-03-31 05:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a95a4d70e9e64a61730604ccf46ee977 SHA-1: 21c7de392061eeecf3c21791f7f79f284a16da29 SHA-256: 41c955f4874ce2832606db2dfc18f0ebb4e10c5e5cf19ec49ddc95b73b5f6f75
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary URLs, 'https://vilenefex.ru/strik?utm_term=arris+tg862r+best+buy', is flagged as unknown reputation, suggesting a malicious intent. The ML classifier and ClamAV also strongly indicate maliciousness, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://vilenefex.ru/strik?utm_term=arris+tg862r+best+buy
    • http://ulekschool.online/28973326065qao0h.pdf
    • https://cdn-cms.f-static.net/uploads/4480880/normal_6043348dc26fa.pdf
    • http://herss.space/webcam_video_recorder_free_for_pc00csd.pdf
    • https://cdn-cms.f-static.net/uploads/4457302/normal_601f0cf289541.pdf
    • http://constructionhouse.info/xeroso824ef.pdf
    • http://b4shop.icu/odd_thomas_espanol_latino08km6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a7a9675a-26c7-434b-b370-dc2fbac30f0b/how_to_look_up_driver_license_number.pdf
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_3996f7dce45b493c82f1a613aaf0c385.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a0ec4520-1ec0-455a-9cdd-8cbcfe507205/ford_mustang_gt350_for_sale_az.pdf
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_cd319bca46ec4f579155c0b1625473f2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3ab7e868-fee6-48cd-a9da-3c9cd82a2679/paritolitukokumuv.pdf
    • https://uploads.strikinglycdn.com/files/a276900b-1490-40b8-9d27-4edab8a732be/is_mass_culture_the_same_as_popular_culture.pdf
    • https://6ba8113a-99dc-4618-97bf-d7180f10ff72.filesusr.com/ugd/b6edda_b861779980e9470087a8e48021231193.pdf?index=true
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_6d7efe3ac53149e9a43c0e99128306e1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fb8477d4-44b7-4453-b5a3-abb5f6967bec/system_software_engineer_salary_malaysia.pdf
    • https://uploads.strikinglycdn.com/files/98b0d652-161e-487c-98c3-51d3d58121ba/97634579174.pdf
    • https://acaa17bf-cf2e-4132-a9e9-810271eb8bc4.filesusr.com/ugd/ab5b4c_57f0cf59fba5478c8d6e19e0a1b59dc0.pdf?index=true
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_aab81f219184440080fe60aaf59b7555.pdf?index=true
    • https://uploads.strikinglycdn.com/files/061dcb45-2996-4ce8-af00-6d94f8efab21/kozelemawawad.pdf
    • https://uploads.strikinglycdn.com/files/65336701-2cf0-463b-8fe0-afc1daf12910/44097278949.pdf
    • https://1ee34b3e-bfcb-4e25-b227-79ffd44eef10.filesusr.com/ugd/9d5096_60e3f058503f4bf18a4faa955891c7d9.pdf?index=true
    • https://71bfc0c6-4bef-405a-aee6-9e9dcaab3d12.filesusr.com/ugd/708cfd_39694bd8faab4c8ba4a9cccd14ffd964.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001242b.bin
31d4dd97cf5147e6b059c24d0fa5ef82248f625d272ff84a9e6c0d2f8a785f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1242B 6812 bytes
font_01_sfnt_off00013560.bin
1b05fa04645b0ced92d1a6ee45ce97845bbd65c02599d4cf4bc4e19ed03d90ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13560 5324 bytes
font_02_sfnt_off0001479e.bin
8e12927ce3d13110ee6fddfe4f4c74fa6979c6339d88545a3746379aaa056866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1479E 11940 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.