Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4efdaf63f8d37d8…

MALICIOUS

PDF

77.9 KB Created: 2021-04-07 00:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: aa7f04a1585124f6fe55ed3c86ac56a7 SHA-1: f0d68adebf37c17437d7beeeeea08a9d5c18b998 SHA-256: b4efdaf63f8d37d8c5b4664e8938d0b878a87ea69b1471559a5bae5fa5975130
126 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, with a primary focus on directing users to a phishing site hosted on 'resalured.ru'. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure the malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/award?keyword=decluttering+at+the+speed+of+life+pdf PDF link annotation
    • https://firulozide.weebly.com/uploads/1/3/0/7/130775295/ruwokebavuwitu-dixawizore-rolipewut.pdfIn PDF document text
    • https://desebenenoda.weebly.com/uploads/1/3/5/3/135348916/27d2bb0e99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_5feaf226df526.pdfIn PDF document text
    • http://dekovag.mypressonline.com/how_to_remove_hot_tub_control_panel.pdfIn PDF document text
    • https://dabusoze.weebly.com/uploads/1/3/4/5/134585091/sorawefane_puwisitolare.pdfIn PDF document text
    • http://deladinabixek.sportsontheweb.net/mejigedamuwidekejapi.pdfIn PDF document text
    • http://mokemowowove.mygamesonline.org/harcourt_math_4th_grade_workbook.pdfIn PDF document text
    • https://tovamegudisolos.weebly.com/uploads/1/3/1/4/131411857/837945268.pdfIn PDF document text
    • http://padojobimo.mywebcommunity.org/zifikolezuzizewusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462341/normal_5fe62be138685.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/juzowilipi/71905550535.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_35ded66291ee420f93d325afd94f51dd.pdf?index=trueIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_1eb71757983e44c989b5661aa6830a2e.pdf?index=trueIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_789b9bb3293b49daa416c699d8a62101.pdf?index=trueIn PDF document text
    • http://bejanifezilo.atwebpages.com/how_to_best_study_for_exams.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/penumavux.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/xazexedopur.pdfIn PDF document text
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_0640709567c24d10aa361ed7d709d8ec.pdf?index=trueIn PDF document text
    • http://kulebosux.myartsonline.com/great_writing_4_answer_key.pdfIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_a1f08ec3e9d04141ba44df0e97f7b4a5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/natomopuxexalimejuzosoxin.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/what_temp_to_cook_chicken_breast_on_george_foreman_grill.pdfIn PDF document text
    • http://kesupipipiret.onlinewebshop.net/fisco_agenda_2020_gratis.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_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 5416 bytes
SHA-256: 499a01c088b09f545f00bcac38ae1135238693ee9c9074b897cb5019882a7de4
font_01_sfnt_off00010397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10397 11372 bytes
SHA-256: f1f209d298a5e965ba0fb2615b53b47f9714e34f60ee8d647f8248b5a48da4a1