Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7af6ec6530077c…

MALICIOUS

PDF

71.7 KB Created: 2021-03-28 13:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 85b99ef506bc314ae8cfacd1db7fcae1 SHA-1: d47ee296fed39bb9dc8087f85c8d8e0b5c9713c7 SHA-256: 0a7af6ec6530077c2b6b27f07754d6ecbe62deadbdabd10bc87a73e79f10ddb7
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 point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. One prominent URL, 'https://xezojetit.ru/award?keyword=1975+cessna+172m+poh+pdf', suggests a lure related to a specific PDF document. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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-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://xezojetit.ru/award?keyword=1975+cessna+172m+poh+pdf
    • http://lodazumutedine.iblogger.org/28863479527.pdf
    • https://nekemobo.weebly.com/uploads/1/3/5/3/135323096/wunezi.pdf
    • https://sibomidejuxeda.weebly.com/uploads/1/3/4/5/134599986/a63b64.pdf
    • https://didoruzokikad.weebly.com/uploads/1/3/0/7/130739542/bufebanidok_loxirenefiwubu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_51c1a60f27b84a6cb852f7fc4bb69700.pdf?index=true
    • https://s3.amazonaws.com/luworizesupox/3._1_descriptive_adjectives_worksheet_answers.pdf
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_561e88e485ea4d429f28ede23d063023.pdf?index=true
    • https://a867a740-3546-49c9-bb92-c76f735cad7e.filesusr.com/ugd/c312ff_f529d613e4df4ff2859a9c83b1b217ce.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4ff61264-80b7-47cb-a4b4-271a8c86d95d/ranger_medic_handbook_4th_edition.pdf
    • https://uploads.strikinglycdn.com/files/c04be3b5-b2e3-4bda-b613-df360a6564ed/imax_b6ac_fake.pdf
    • https://s3.amazonaws.com/resisuna/anatomy_of_flowering_plants_ppt.pdf
    • http://repikigerudu.rf.gd/datacion_con_carbono_14.pdf
    • https://uploads.strikinglycdn.com/files/9bc50a03-0446-48d5-9cf1-4041ea49b906/2493698798.pdf
    • https://uploads.strikinglycdn.com/files/987408de-46a0-470d-bd6f-2656d4bab8b6/tisanoxamukovejexokuk.pdf
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_2ddb17834a3f4169a83ba29b40cd916c.pdf?index=true
    • https://3e206333-d6ff-4be5-a246-6289f7259d3b.filesusr.com/ugd/973a7d_3f41eb55f0d046ac93922f3697610007.pdf?index=true
    • http://kexejitevomosef.rf.gd/cardiorenal_syndrome_adalah.pdf
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_c1c7c6da897f47f99e6881c88164f42e.pdf?index=true
    • https://s3.amazonaws.com/falevi/82280938809.pdf
    • https://s3.amazonaws.com/faduxodiwo/5331051885.pdf
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_5cf8e8a2f7a14846ae29439ed28166d7.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_off0000d78c.bin
dd7ebda9b96dfe22d0f309189763047eb103b8cc7dd99994b29fab9b9e11f347		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 5716 bytes
font_01_sfnt_off0000eaee.bin
81760a67a9d3c39b96081e712c9053005efffc53edf02fac3f723ef3099859b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 11380 bytes

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