Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d471ba8f2895b0…

MALICIOUS

PDF

101.1 KB Created: 2021-02-19 03:15:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 35208b9ffefbc3946d7a418712d18c6a SHA-1: 03b3c6bea2616c674c0fd36613ea1f5ba0266733 SHA-256: 28d471ba8f2895b06d23fdb0c26738d31ddf2216a2885e3ebc8acebf4b016cb1
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL pointing to a phishing site, as indicated by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics. The document body, though heavily obfuscated, suggests a lure related to business planning. The primary IOC is the external URI that leads to the phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jottigo.ru/strik?utm_term=how+to+make+plan+for+small+business PDF link annotation
    • https://cdn.sqhk.co/vizelupavew/fthbHhd/45589771473.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_5fe63ee5ca3a6.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/l9Kjehh/23051850485.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/fNjaibX/gefolewuz.pdfIn PDF document text
    • http://femojel.iblogger.org/lusinakabek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392218/normal_600c59f59312b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421468/normal_602add1da88d2.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/pgcjeg9/car_insurance_cost_california_calculator.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5fd6dac783944.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/bopuxosavubare/portfolio_templates_free_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/gowozukawemapimabafu.pdfIn PDF document text
    • https://s3.amazonaws.com/wurivuve/academy_stars_6_workbook.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/macos_sierra_app_store_link.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/19661465250.pdfIn PDF document text
    • http://ruludamena.epizy.com/kurejawemujelelepo.pdfIn PDF document text
    • https://s3.amazonaws.com/kovilowab/40595506068.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/chakkwein_suit_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/agronomy_of_field_crops.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_off00014f86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F86 5304 bytes
SHA-256: 4b231d100a25f44d331ac8bd454ea5f0ed881f14cc22a7d2ede3955d638dd3b5
font_01_sfnt_off00016183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16183 10944 bytes
SHA-256: f89ab180923c5d3a283255f2dcdd2b1b256745a2dcf61de3ce03e7446e7e7b9f

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