Malicious PDF — malware analysis report

Static analysis result for SHA-256 8963dfc37ca66eaf…

MALICIOUS

PDF

73.3 KB Created: 2021-03-14 04:22:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b33c5d70198eed28019a9d200df272bf SHA-1: cac663dc5bffea38d09876c03ff18325d7c34725 SHA-256: 8963dfc37ca66eaf5a23eec79e265fa9018a1212eaa0684b5f1dc63a5306800c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary focus on 'xajibur.ru' which appears to be a link farm for games. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier strongly indicate malicious intent. The presence of embedded URLs suggests an attempt to redirect users to malicious websites, likely for phishing or malware delivery.

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 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://xajibur.ru/wix?keyword=free+running+2+unblocked+games PDF link annotation
    • http://gaxenop.medianewsonline.com/68971678890.pdfIn PDF document text
    • https://zuzunavodezap.weebly.com/uploads/1/3/0/7/130776081/778742.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/toyota_camry_for_sale_louisville_ky.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/31206675512.pdfIn PDF document text
    • http://tigadugutuvatix.mygamesonline.org/11072556492.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/how_much_does_a_nutritionist_make_a_year_in_canada.pdfIn PDF document text
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/gudowefitegefamilube.pdfIn PDF document text
    • http://tigadugutuvatix.mygamesonline.org/industrial_marketing_notes.pdfIn PDF document text
    • http://kurametugugu.mygamesonline.org/poulan_pro_leaf_blower_replacement_parts.pdfIn PDF document text
    • http://nomokesus.sportsontheweb.net/botany_practical_book_part_1.pdfIn PDF document text
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/8924495.pdfIn PDF document text
    • http://jaxagogilexet.sportsontheweb.net/21094522629.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gumizaxewa.atwebpages.com/u_verse_tv_guide_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71ccca54-46ae-4d7b-ad27-5b1d650ee1d8/nagetepiwa.pdfIn PDF document text
    • http://disoluje.myartsonline.com/super_metroid_impossible_agdq_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cadbfc25-2d00-4974-91f0-26d295f41860/278894570.pdfIn PDF document text
    • https://s3.amazonaws.com/rejiner/solving_quadratic_equations_using_the_quadratic_formula_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/kekudubifasalosaf.pdfIn PDF document text
    • http://tipokeviti.atwebpages.com/6003194603.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_off0000dff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 5548 bytes
SHA-256: d23063a152138be5aed0bfa753291c514b1a4b867403c49848d1f118bc2044c0
font_01_sfnt_off0000f2c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C6 11008 bytes
SHA-256: 7191e304a24e93ef9f8ab1213e206382c987e6ef6a72ed86a7c37023ddde884a

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