Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf30d9010516e436…

MALICIOUS

PDF

76.5 KB Created: 2021-03-17 00:29:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 2d906d17c59ed32ad591bbc427aa40ef SHA-1: 9c5e7a0990ea082a1b27804c63e79ba3f4bb8134 SHA-256: bf30d9010516e4367faea8931df932f171c277bbd2b741e66b7f8638c141687a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which point to benign-looking PDFs but are likely part of a link farm to obscure malicious activity. One prominent URL, 'https://zajinet.ru/wix?keyword=steal+the+diamonds+sludge+life', is directly associated with the malicious classification. The document body's content, though heavily obfuscated, suggests a lure related to 'stealing diamonds'. The presence of PDF-specific heuristics like 'PDF_SEO_LINK_FARM' and 'PDF_URI' indicates a strong attempt to redirect users to external resources, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=steal+the+diamonds+sludge+life PDF link annotation
    • https://cdn.sqhk.co/vobipibomuk/ZhdLuij/tezivujafaroretowek.pdfIn PDF document text
    • http://najezeb.22web.org/favovav.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/cqo8idk/pico_question_examples_nursing_burnout.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/pdfmake_angularjs_html.pdfIn PDF document text
    • https://vokoziga.weebly.com/uploads/1/3/4/3/134389491/7eb4411f4.pdfIn PDF document text
    • https://diloxutal.weebly.com/uploads/1/3/4/5/134598378/vijulir_kawezusara_jinovobot.pdfIn PDF document text
    • https://cdn.sqhk.co/buwaxaxodi/dgdggAF/77025947073.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/tecnicas_de_redaccion_coherencia_concordancia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/genedesowul/odia_sambalpuri_bhajan.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/sofajilev.pdfIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/what_do_atoms_combine_to_form.pdfIn PDF document text
    • http://tolamepaduxeju.rf.gd/rupidapivuxamuluzetem.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/division_chart_1-100.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/72680408198.pdfIn PDF document text
    • http://supajiwa.myartsonline.com/navy_regulations_on_neck_tattoos.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/67704929474.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/rocksmith_2014_cherub_rock.pdfIn PDF document text
    • http://pinopog.rf.gd/template_slideshow_premiere_pro.pdfIn 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_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 5328 bytes
SHA-256: 0d91f1edb2f546364c4945f33cf2f753cb16371993bd02defa0265960324deea
font_01_sfnt_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 12400 bytes
SHA-256: 5283ccd8e1b40b2c7fafa68908910e582b6197c4a2009e26baa811c4634eb07f

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