Malicious PDF — malware analysis report

Static analysis result for SHA-256 b04262ef211d559e…

MALICIOUS

PDF

75.1 KB Created: 2021-03-22 07:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 3d59e849e6f3cba7131d6ab83ab6cd40 SHA-1: 267aadee3ab75dd91e1d51a0f878a712848df14a SHA-256: b04262ef211d559e7645f86d0f2de2193df9a08e49a7ddaacc3e38ffbd7b529a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable hosting or link farms, indicating a likely attempt to direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are consistent with techniques used to deliver second-stage payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/123?utm_term=bhagwa+rang+ringtone+song++pagalworld PDF link annotation
    • https://kimivatebuxokas.weebly.com/uploads/1/3/4/7/134702804/rugozufejebax_konaxidosilopu.pdfIn PDF document text
    • https://cdn.sqhk.co/bofogarabu/oghvhfZ/84187455884.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/jdBtgjJ/49952661772.pdfIn PDF document text
    • https://pafajarofotixo.weebly.com/uploads/1/3/4/7/134773208/9268468.pdfIn PDF document text
    • http://bivisurat.22web.org/12960678916.pdfIn PDF document text
    • http://xubatazu.22web.org/diploma_mechanical_engineering_drawing_books_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393179/normal_605800499aaae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370778/normal_5fec36937e71d.pdfIn PDF document text
    • http://okrasote.info/norufamatff65.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/6a237cd01f45ad.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/W0ifigg/zalinuxupemuruxino.pdfIn PDF document text
    • https://cdn.sqhk.co/kojogitu/zShicpJ/94641406765.pdfIn PDF document text
    • https://pezebojikunebal.weebly.com/uploads/1/3/4/3/134362674/lezugalopijo.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/83e2758d921.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_60397628674fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://buzezozamedat.rf.gd/price_for_honda_rebel_300.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/wet_media_brushes_photoshop_cs6.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/decimals_to_fractions_worksheets.pdfIn PDF document text
    • http://jegefikaxat.epizy.com/5th_grade_math_minutes_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/23085107278.pdfIn PDF document text
    • http://xegukamadoso.epizy.com/guided_reading_level_humphrey.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE26 5360 bytes
SHA-256: 76093c0fae3effbd5b0d43ad509aaedb4dc534139a04790d7a0bb470d5459e43
font_01_sfnt_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 10276 bytes
SHA-256: ae23c91f90b703c5638473e0561f6874e950a8f5e39ec29e7680b7c5b73fa483
font_02_sfnt_off000103c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 7948 bytes
SHA-256: da4178fa9cc68d53444859974a8068962019704a26e170d3609155758c5d41b3

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