Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df3ae98b95235b7…

MALICIOUS

PDF

63.0 KB Created: 2021-02-18 21:23:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fb7ba6fdb4d4e30623037aa4c3f584e0 SHA-1: b346b0cca108bd4bec7738f78a628d5ffe03cd28 SHA-256: 3df3ae98b95235b7b3036f8a9e19939d23c85bf82eecdba359e14adf6a776639
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing sites, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'Red skull 3d puzzle instructions', likely intended to direct users to malicious URLs.

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://jacksth.ru/123?utm_term=red+skull+3d+puzzle+instructions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464534/normal_5fdf632783448.pdfIn PDF document text
    • https://xilamexazoleguj.weebly.com/uploads/1/3/2/6/132695560/neperimofowokeb-zugilij-rekinenu.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/a96241e98a6235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407733/normal_60100efa8b076.pdfIn PDF document text
    • https://cdn.sqhk.co/bepoweruga/ajbUIrk/video_player_apk_android_4._2.pdfIn PDF document text
    • https://dexazime.weebly.com/uploads/1/3/1/4/131437554/f3a3efdf.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/fjghczK/best_buy_customer_service_specialist_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/vufebevefo/idSmbib/midesofekegafixasatisojum.pdfIn PDF document text
    • https://cdn.sqhk.co/tijatabov/fZdcyi5/photo_collage_free_download_for_android_phone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413454/normal_5ff9737a693cc.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/farokof/chew_the_scenery_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/16172538436.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/4632417263.pdfIn PDF document text
    • http://gagivipupine.epizy.com/ayurveda_books_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/aptet_previous_question_paper_with_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/business_card_creator_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/zofevivaginubikovu.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/denote_vs_connote_worksheet.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_off0000bafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFA 5140 bytes
SHA-256: 4763d52283e6abcda1def0428bc4040b9baeb269d322f53fa00521f76df4b893
font_01_sfnt_off0000cc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9C 10024 bytes
SHA-256: 0c1575fa9e7c10f3e7757fdfa6fd64ae57543464887c352a39c5948c749a0e74

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