Malicious PDF — malware analysis report

Static analysis result for SHA-256 2015f4747440f293…

MALICIOUS

PDF

78.5 KB Created: 2021-03-08 11:43:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 043650a1a71373e981d637add7c1fc5a SHA-1: dcbe031ba18460ec8d8dc79f5ca6fab73755ca82 SHA-256: 2015f4747440f29332b22bdcee509d003d2384e6a9bbba92a16ae38d249beb51
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a large number of external links, many pointing to seemingly random PDF files, suggests a link farm or SEO poisoning attempt. The primary malicious URL identified is zajinet.ru, which is likely used to host phishing content or distribute further malware. No scripts were extracted, but the PDF structure and link farm indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://zajinet.ru/strik?utm_term=calories+in+dunkin+donuts+veggie+egg+white+sandwich PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446645/normal_5fd07c1a73527.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448357/normal_602958116c2b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453734/normal_5ff6bf3e84d3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499622/normal_5ff543d0b6575.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476930/normal_5ffb6db22a011.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gopuze/brasileiro_serie_b_table_and_form.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/fevageliw.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/how_to_contact_robinhood.pdfIn PDF document text
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_10268040a91741a488e6b2a5a42438df.pdf?index=trueIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_02eb8934dd754041a45cfeb2a449c63a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/merek.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/tolanobabamoje.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/60713754824.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/cribriform_plate_function_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/52220822148.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/nissan_350z_performance_parts_uk.pdfIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_26496ed55c764f9a9cb305647c1f15d5.pdf?index=trueIn PDF document text
    • https://00c0516a-c822-4344-a779-6f74e039753d.filesusr.com/ugd/9e41f0_bb81b7e0d301486da4d47c96ae8a049e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/balanced_scorecard_book.pdfIn PDF document text
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_4b004c366922455886ce3cc6ff912076.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 5324 bytes
SHA-256: 0baa72bb3a18682edbd92eedbdde6853f3d42665c95bfc4f1c5ca285d8e88326
font_01_sfnt_off0000fa2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 10508 bytes
SHA-256: 02e55a16fb64c34c50a127f685c4fbac7d745c0230c6f98b22408d9f82dcba43
font_02_sfnt_off00011e3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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