Malicious PDF — malware analysis report

Static analysis result for SHA-256 59710d406c7317c4…

MALICIOUS

PDF

84.0 KB Created: 2021-04-20 11:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3895a3fe90e3c2f12004c4267bffc225 SHA-1: 6819ebfb171fd0530f169a7371a2bcf7a776f110 SHA-256: 59710d406c7317c4352fc50b1a6770cc0a9873416f0e43da9dbc6147a341262c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to unknown or potentially malicious domains, indicating a link farm or SEO abuse tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/strik?utm_term=fantastic+beasts+and+where+to+find+them+in+order
    • http://help-service-support.com/lunovadotifedumutk2i8m.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • https://givudaxoj.weebly.com/uploads/1/3/4/4/134490896/ruginejenek.pdf
    • http://lurubalopare.sportsontheweb.net/26244905394.pdf
    • http://cmbclientes.com/15501349077v2fiv.pdf
    • https://jogotipopawufi.weebly.com/uploads/1/3/0/7/130740597/posudobukakireli.pdf
    • http://rent-nout.site/rinokodvn8f.pdf
    • http://jotafitosixa.getenjoyment.net/nejujefapej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/gixirojozogufux/irregular_verbs_perfect_english_grammar.pdf
    • https://s3.amazonaws.com/sefiwegegagu/free_menu_math_worksheets.pdf
    • https://b1f0a730-f0e4-4bcf-918d-a915077b90d0.filesusr.com/ugd/a7c69d_e514fb76eb154be5b599087422ec45a9.pdf?index=true
    • https://s3.amazonaws.com/zubuwujoxom/bimof.pdf
    • https://s3.amazonaws.com/ziwuvijevo/nivafoboturezuligigiko.pdf
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_2f01d7c7a5254878a9fedc14e5c21fa0.pdf?index=true
    • http://wiloradakuno.onlinewebshop.net/logepagirutukuladexotenir.pdf
    • https://s3.amazonaws.com/mujevubutukoxu/cambridge_latin_book_2_answers.pdf
    • https://cb47f074-0476-4434-b381-5672a365cab8.filesusr.com/ugd/c46c8a_8be1c923ef124a648c2d95e1093440d3.pdf?index=true
    • https://s3.amazonaws.com/nefunupu/bread_machine_recipes.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc0b.bin
7bb7d39047430c82dac57debe973d91fe486064661c56e3524aca11bb0c9dc13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0B 5204 bytes
font_01_sfnt_off00010d92.bin
c33991bfee585afceb64678d7e0c38def3aa0a09b109ec4df649c58086401ae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D92 11264 bytes
font_02_sfnt_off0001340c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1340C 4324 bytes

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