Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e0859ff330cf65c…

MALICIOUS

PDF

80.3 KB Created: 2021-05-28 20:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9235eb32cc0b831b8a93439a4a625010 SHA-1: d224c25f9d0bf573ba5d52336b90a210e178c6b9 SHA-256: 2e0859ff330cf65cf4b041072e4cd82c84b0fbbf586dba8a4a4623bdb88871ac
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm, indicating a malicious intent to direct users to potentially harmful websites. The ClamAV detection and ML classifier strongly suggest this is a phishing or trojan distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/strik?utm_term=jensen+vx7528+user+manual
    • https://xojexibawetu.weebly.com/uploads/1/3/4/3/134361221/2a432da56.pdf
    • https://vefaruturibil.weebly.com/uploads/1/3/4/5/134525254/zaxemus.pdf
    • https://nagaleburanab.weebly.com/uploads/1/3/4/3/134379557/befonujas.pdf
    • https://cdn-cms.f-static.net/uploads/4468296/normal_60512f0ce265c.pdf
    • https://babulavired.weebly.com/uploads/1/3/0/7/130775389/masunutubalevojufek.pdf
    • https://cdn-cms.f-static.net/uploads/4411717/normal_601682ababece.pdf
    • https://gikeviviku.weebly.com/uploads/1/3/4/7/134707445/f0f26c25c4a0.pdf
    • https://static.s123-cdn-static.com/uploads/4446789/normal_600220791a2e4.pdf
    • https://cdn-cms.f-static.net/uploads/4415070/normal_6047a5440f933.pdf
    • https://static.s123-cdn-static.com/uploads/4384640/normal_5ff5e9d62156f.pdf
    • https://cdn-cms.f-static.net/uploads/4392220/normal_601b87306f82b.pdf
    • https://cdn-cms.f-static.net/uploads/4451757/normal_6022c8212d00f.pdf
    • https://static.s123-cdn-static.com/uploads/4374963/normal_5fc98a2d2893c.pdf
    • https://fujubonutebi.weebly.com/uploads/1/3/4/2/134266124/8809f8f5c60f.pdf
    • https://rijujofa.weebly.com/uploads/1/3/4/3/134323569/zasawerafefavipeb.pdf
    • https://sazeduxawi.weebly.com/uploads/1/3/2/6/132695343/setorapomu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b9c4924c-b7c2-475b-882d-8a7de46bbb7f/58726309295.pdf
    • https://uploads.strikinglycdn.com/files/f7fa4088-2696-49cb-9d92-604051c59055/mebakofiwukijezesenane.pdf
    • https://uploads.strikinglycdn.com/files/bd59781e-074d-4578-a9a5-a72e9e3211f8/yeh_shen_short_story.pdf
    • https://uploads.strikinglycdn.com/files/9da36ce1-5493-4d15-8c12-3284f45d507b/essentials_of_statistics_for_business_and_economics_8th_edition.pdf
    • https://uploads.strikinglycdn.com/files/f8ba9a58-ad8b-47ef-9e41-b40418d8bbb1/40819852547.pdf
    • https://uploads.strikinglycdn.com/files/5b21fe83-f8f3-4b33-a7bd-053ec66d8df9/65737256845.pdf
    • https://uploads.strikinglycdn.com/files/4d39e4fa-1dcb-4ea7-9667-cc3de63c29df/45375027120.pdf
    • https://uploads.strikinglycdn.com/files/dbc8d9e8-5f07-452b-b13e-a0606098e273/how_to_record_my_own_music.pdf
    • https://uploads.strikinglycdn.com/files/1d673e2d-3313-4148-91ea-9c31e6d610be/55016748245.pdf
    • https://uploads.strikinglycdn.com/files/3b2937d3-0e9c-4610-a07c-e2460468efc2/7571733637.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_off0000f903.bin
b5c42e96b8b6f97d2d8785ae3a14c315208d2a86d4760df41959d9979d7a11eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 5476 bytes
font_01_sfnt_off00010b9b.bin
3a3d08d3472966a0f2e236f77881f9554f442a47d874c5f70c712654def286d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 11380 bytes

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