Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bb38a218a5ab18…

MALICIOUS

PDF

75.1 KB Created: 2021-03-07 08:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 07abe6575180581c132ab1bbbb9cb690 SHA-1: 73d7d0b288f3ab9d4c9bdc1ec0f03f91189a0fa7 SHA-256: 55bb38a218a5ab18be1c2bb6f18b06ddf27eac599b87d25e31df34df48c53e48
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and forming a link farm, strongly suggests a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/award?keyword=que+linea+de+montaje PDF link annotation
    • https://wolaserirefuf.weebly.com/uploads/1/3/1/6/131637046/xofopef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372399/normal_600611997c8e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494435/normal_6004190d2481e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387817/normal_5fc5922a2e92c.pdfIn PDF document text
    • https://pawupakupofodav.weebly.com/uploads/1/3/5/3/135388754/2588056.pdfIn PDF document text
    • https://nazolaruwesibag.weebly.com/uploads/1/3/1/4/131453197/vogipiw.pdfIn PDF document text
    • http://libumuzu.22web.org/adverbs_and_adjectives_3_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449014/normal_6027ccae4c2f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_600e60c6d0a5b.pdfIn PDF document text
    • https://zujavezamuni.weebly.com/uploads/1/3/0/9/130969293/vibig.pdfIn PDF document text
    • http://xorabawik.medianewsonline.com/28380311113.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biwomilorawud.rf.gd/6389079850.pdfIn PDF document text
    • http://munoxefarofow.rf.gd/nezagojunot.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/61381095677.pdfIn PDF document text
    • http://damokoz.epizy.com/xomizonu.pdfIn PDF document text
    • http://gifimedirawi.epizy.com/47963648116.pdfIn PDF document text
    • http://vimukomexetad.rf.gd/adjective_worksheets_for_first_grade.pdfIn PDF document text
    • http://zorijefugixor.atwebpages.com/32626403421.pdfIn PDF document text
    • http://kufekisawisewo.onlinewebshop.net/20840068459.pdfIn PDF document text
    • http://luxixeg.epizy.com/cartoon_maker_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/89759098096.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_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 4832 bytes
SHA-256: e9ad282f589539befd598f2b69edff419ae6213405de6abf762ed1b5b48e1e24
font_01_sfnt_off0000f955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF955 11112 bytes
SHA-256: a8ed44b9221c36ead54c2cb8f170fa9ace2e88c23d9343d4ead5d114af9cd79c

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