Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f071a5207ad15c…

MALICIOUS

PDF

73.1 KB Created: 2021-04-08 16:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: dc02ad686bca7c8af1f0bd361430710c SHA-1: c9239deacafe076670d986518a435fb0cc7739d3 SHA-256: 43f071a5207ad15ccf0173a684b33305bd3318a5cd383f947401d037ee4f7278
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous URLs suggest it's part of a larger campaign, potentially using embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=piano+adventures+level+2a+lesson+and+theory+book PDF link annotation
    • http://ouily.xyz/dekuketerejulagokiboxidon09nnt.pdfIn PDF document text
    • https://cdn.sqhk.co/nurijodefa/cRhhv7m/mazel_tov_gift_shop.pdfIn PDF document text
    • http://pinerapidsrr.com/52158617510bi66j.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/jcVfiih/sawofiroxi.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/gjjdgjK/8421857570.pdfIn PDF document text
    • http://beliyden.xyz/48748546820uoud3.pdfIn PDF document text
    • http://trychambre.xyz/how_do_i_reset_my_samsung_refrigerator_freezervkbot.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/jjbD5wB/belurenalimasub.pdfIn PDF document text
    • http://presalle.xyz/46051409557owe38.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/hbNh7jj/89417029534.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://94cb5446-44f7-499c-8ddd-8d9df3a2db3d.filesusr.com/ugd/9b9c26_21841f979f1d439bace2eec467e00a81.pdf?index=trueIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_0bb480402865427b9115f79079ff95bf.pdf?index=trueIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_869c8e33045f49b2a181280cd89210c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/9796374728.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/hebrew_bible_interlinear.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/92484576693.pdfIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_45d45c920c76440ea1bd24682ee37f6e.pdf?index=trueIn PDF document text
    • https://da9d63b4-fbfd-4f6f-88e7-06ac0d76355b.filesusr.com/ugd/ca300b_dfe08e0e446d4183a43130001f0207e1.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_df1fcec96bb043a2abeb0af667a92520.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazixipame/34860491238.pdfIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_1396773aa248417a8ab980327d394a90.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/gta_vice_city_cheats_android.pdfIn PDF document text
    • https://86146b48-cf95-488a-b5a0-22832f4589a6.filesusr.com/ugd/3b4eee_ec208f400ce04c1f8d1fbae7251d546e.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_5ee4d143dfa14bd1bbbcb87ca76b4534.pdf?index=trueIn PDF document text
    • https://deed868a-3c3f-4b0d-b3ae-f9ebe8a38c33.filesusr.com/ugd/95283b_ca7bc66f94ec4a71be607881485048c1.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC95 5412 bytes
SHA-256: 2d24d96a88ab4e82ceeb9d2300704491ad81418f8bcf9c7cc4825d444077c1a1
font_01_sfnt_off0000ef01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF01 10944 bytes
SHA-256: 6051aeb86f87a31d83884bef525c316b6ee4f34ea51eafcbc46b5376367876ed

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