Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37f0c850b6b9029…

MALICIOUS

PDF

81.4 KB Created: 2021-05-29 10:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8f0aa46007053a73c4b1f2b73461379 SHA-1: 06e2250410cc987a41670ec5b390f15a80478b50 SHA-256: d37f0c850b6b9029bd2a9c50d933e88d2687ec6c8cde5af7420411ef01a71b74
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'https://leonvi.ru/123?utm_term=artificial+intelligence+article+pdf', suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

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://leonvi.ru/123?utm_term=artificial+intelligence+article+pdf
    • https://cdn-cms.f-static.net/uploads/4447464/normal_6046455e42fd4.pdf
    • https://xebuzoxovekig.weebly.com/uploads/1/3/4/0/134018553/vazomofip_pomefe.pdf
    • https://cdn-cms.f-static.net/uploads/4461202/normal_5fd9f4030960a.pdf
    • https://lupobola.weebly.com/uploads/1/3/3/9/133999804/de40e.pdf
    • https://naxufubiromu.weebly.com/uploads/1/3/0/7/130738890/goposi_latogeg_rotetosakolim.pdf
    • https://cdn-cms.f-static.net/uploads/4392647/normal_6056ea9a9e6e9.pdf
    • https://bamigabimav.weebly.com/uploads/1/3/1/6/131636977/ed1dec23.pdf
    • https://static.s123-cdn-static.com/uploads/4382960/normal_5ff5319e245c3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b3bc5386-147e-492b-b94f-111273cc0b75/sibupuvipavoveloxipu.pdf
    • https://uploads.strikinglycdn.com/files/49e7d5ac-23d7-4400-94c2-f961f7340ce2/fumitawixapukomom.pdf
    • https://uploads.strikinglycdn.com/files/e632a95f-eb37-48db-9f45-ca29febd6e12/network_security_architect_salary_uk.pdf
    • https://uploads.strikinglycdn.com/files/593d819a-2c18-497b-acc3-1b4b3b966315/funipowofugaguwivizaxisij.pdf
    • https://uploads.strikinglycdn.com/files/f9b90301-a2f4-4d63-bff3-6bddc3e57612/58957315903.pdf
    • https://uploads.strikinglycdn.com/files/dbccc503-6be1-4987-af02-9a420aa98eb4/how_long_does_it_take_to_dehydrate_beef_jerky_in_a_dehydrator.pdf
    • https://uploads.strikinglycdn.com/files/8df5fd2d-1076-431e-a1ce-1d235a3ef4a1/how_to_write_a_supreme_court_majority_opinion.pdf
    • https://uploads.strikinglycdn.com/files/7dec1de4-a2f5-48ad-a9c9-65c8ddf0a677/hannah_arendt_the_human_condition.pdf
    • https://uploads.strikinglycdn.com/files/816e4d43-f12d-4e9f-96ff-92d3f4caecca/acido_folico_gravidez_quando_tomar.pdf
    • https://uploads.strikinglycdn.com/files/7f5c558e-02c9-42bd-863d-e9227cbbf3d3/96688759458.pdf
    • https://uploads.strikinglycdn.com/files/9878ab1c-903b-479b-9c6d-459d7f846245/27745381518.pdf
    • https://uploads.strikinglycdn.com/files/cc366789-d997-41a3-a23d-e2eb89899e41/jebigupelut.pdf
    • https://uploads.strikinglycdn.com/files/b9537814-1b67-472b-9cc3-cf84f46f1de5/lg_hbs_1100.pdf
    • https://uploads.strikinglycdn.com/files/2fdadc4b-8f48-4020-988a-29c416868f7d/material_safety_data_sheet_free_download.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_off0000ffc6.bin
2c1f603b8df58858f7061b9dcd1d36b9f29f3b325b2a27513d053179ea9b06d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 5136 bytes
font_01_sfnt_off0001114f.bin
0b760c71376c345a997eec633fd7b1902db90f84412b30eb826c4b16eb263738		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1114F 10720 bytes

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