Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b92f410866d1208…

MALICIOUS

PDF

85.7 KB Created: 2021-04-28 21:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6aef214d3284505bd81e4ad6f10d7fb5 SHA-1: 2701dfeb866af43e8395e5da9b7fed209ba99f49 SHA-256: 1b92f410866d12081b1710330f0657001e0df5ca6b6093561753335ea4a77ca5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. The primary malicious URL, https://botokaw.ru/strik, is presented as a search result for 'Dunkin donuts chai latte calories' to deceive users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=dunkin+donuts+chai+latte+calories
    • http://rijogemas.iblogger.org/76696459574.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b7874475-a249-40c6-a3cb-b06fbb278733/the_monkees_christmas_albums.pdf
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_f65ece729e01473ea0af44cf8a2dea84.pdf?index=true
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_bf9ad5abf2b94b1c81b62f0b716342ef.pdf?index=true
    • http://sodexodape.rf.gd/cardiac_cycle_steps.pdf
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_d8c6a82cf31f4974b609ff05a984ed87.pdf?index=true
    • https://12c9c681-cafc-4f88-93da-cb6f471fd49a.filesusr.com/ugd/f09a9d_2c5d47d5f1b145aaa221275273995e4c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/894bc64b-205c-41e5-83fa-f15fdfce82c1/my_troy_bilt_2410_snowblower_wont_start.pdf
    • https://uploads.strikinglycdn.com/files/2a4af31f-a5d7-4f08-b650-bdcd0e4cb815/profusion_heater_1500_watt_manual.pdf
    • https://uploads.strikinglycdn.com/files/184eb42f-f897-4a7f-9f6b-c096723a93d4/17_indisputable_laws_of_teamwork_ppt.pdf
    • https://uploads.strikinglycdn.com/files/6e39944d-34da-4d0b-b917-a6d6547c4044/gofonigugerivibif.pdf
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_76c1b78ce9444b768336cee81e07a091.pdf?index=true
    • http://gikuxoxabak.epizy.com/ct_brain_anatomy.pdf
    • https://uploads.strikinglycdn.com/files/aec2668f-8c52-468e-9e11-8750532e8a5c/41811156862.pdf
    • https://uploads.strikinglycdn.com/files/cc0ad691-62bb-44c9-8a9f-bbb94ddb47eb/31225021114.pdf
    • https://19a4122d-28db-4ec2-a9e3-8c1e87f24dd5.filesusr.com/ugd/70d0b7_58379a25dfb74a9fbe53722633a29e2e.pdf?index=true
    • https://6632aaff-1fe9-4f1d-acb3-7d444e457837.filesusr.com/ugd/ce4b7c_097059cbbc3d4ac899b2fedac1f90e6b.pdf?index=true
    • https://0eaabcdb-938a-45a6-85a3-1a7d796bbcdd.filesusr.com/ugd/8d6d25_40664e76a4244654bae76bbcfb76d34f.pdf?index=true
    • https://113c517c-d7b0-4b36-99d7-6722bcb7ef36.filesusr.com/ugd/8e66a5_0eef1396e5cf4766a6cda52664882139.pdf?index=true
    • http://pugagewuda.rf.gd/atresia_intestinal_congenita.pdf
    • http://rawuvotatu.rf.gd/36166704416.pdf
    • 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_off00010e8b.bin
9b2e1d841ee1393a04cb095ae6888710aad592a4fc4377041c766abb262b72a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8B 5092 bytes
font_01_sfnt_off00011fd6.bin
0cf285dbe26ac020ef09413d87aa48ea68d9df95ea25b129c2b5bc4ce26bfc22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD6 12140 bytes

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