Malicious PDF — malware analysis report

Static analysis result for SHA-256 66753cf92c4ccadd…

MALICIOUS

PDF

101.9 KB Created: 2021-02-27 20:57:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: ea3b0ee178e3b5c251eabb79b76c0ced SHA-1: f3538d0767b92090087cd52e83b48438b96d5c08 SHA-256: 66753cf92c4ccadde1dcab9f63a3cb4d0334eb990f5ca5b1c1187799e9f39a35
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to manipulate search engine results or direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or link-farming attack vector.

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://leonvi.ru/123?utm_term=tom+clancy%2527s+jack+ryan+season+2+episode+3+recap PDF link annotation
    • http://xijulefabogi.getenjoyment.net/murachs_html5_and_css3_4th_edition_ebook.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/19048448393.pdfIn PDF document text
    • https://xulasimij.weebly.com/uploads/1/3/2/8/132814518/8059304.pdfIn PDF document text
    • https://dodapoxole.weebly.com/uploads/1/3/1/3/131398067/tekilujagorawa_butut.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/how_much_does_a_health_and_safety_officer_earn_per_month.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/rotowan/agreement_of_sale_of_flat_format.pdfIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/cade_simu_cho_android.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/does_short_term_medical_insurance_cover_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/59234527455.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/nationalism_in_europe_class_10_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/main_verbs_and_helping_verbs_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/witcher_2_troll_trouble_sendlers_house.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/can_you_get_reiki_certified_online.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/dungeons_and_dragons_character_sheet_editor.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/reddit_cyberpunk_2077_ps4_graphics.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_off00014ad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD8 5740 bytes
SHA-256: 86349283d1f7a939963664b027169161ad12fbc4ce8d521f452b700e396403bb
font_01_sfnt_off00015e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E65 13780 bytes
SHA-256: a78e9e1c3e1e95e0c060178bba5a74ac5f08c194a196e33eb29a44ec8aa23d3a

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