Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e4bf18100bfd03…

MALICIOUS

PDF

77.6 KB Created: 2021-03-22 20:21:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 26837565652c71c22a8f355c68cd031c SHA-1: b87610d1184764a167d3a99ea7b8230c3878b9c8 SHA-256: 82e4bf18100bfd03b4c951d71f3e991e066f6fd9e07c5ee9f285df058dde0a9a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, indicating a link farm designed to manipulate search engine results. The primary malicious URL identified is pelibifir.ru, which is likely used to distribute further payloads or phishing content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://pelibifir.ru/strik?utm_term=manual+roland+d50+espa%25C3%25B1ol+pdf PDF link annotation
    • http://nitapida.mywebcommunity.org/80676038262.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/active_and_passive_voice_exercises_with_answers.pdfIn PDF document text
    • http://rowomonug.mywebcommunity.org/99059723733.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/sasufufa/dream_girl_2019_full_movie_mp4.pdfIn PDF document text
    • https://6ae5a9c1-8526-45f7-b068-03ddf2465b28.filesusr.com/ugd/87f732_6fd4d25ad0794997aedd713192f083b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c154a163-f7bf-4185-a42a-c1f706315fad/totomelonuximoruxulob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb88b17f-a890-4d97-9288-c9e11727f932/samsung_6_series_tv_bluetooth_keyboard.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/cyanogenmod_13_firmware.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/74317973913.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/case_studies_in_nursing_ethics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8459c218-a8f5-4aed-9c40-2b166ddb12ca/nutunizatojoloz.pdfIn PDF document text
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_96b96e652b26462aba5a2e603bca9c91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e3baf2b-ffa2-485d-85c1-ed83460112b5/jokuki.pdfIn PDF document text
    • https://ca7c05ed-d233-4774-9cf9-08ff86aa6c73.filesusr.com/ugd/b42fd6_ebb5a5e3a37a4b4581a8066d1989e9bc.pdf?index=trueIn PDF document text
    • https://ad9e3d1f-bb22-46ca-892e-b6aa3325a756.filesusr.com/ugd/837d34_93f7ab8888c5403ab38f30eb17060a4c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/62316c2e-de18-49a7-910c-f7353e4eeb7a/spss_multivariate_survival_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/baby_shower_invitation_card_design.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_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 5520 bytes
SHA-256: e3f67dbfdd93629c356d1102437e28d6f6bd8c931b3093ee5bcfca5fddcae7d7
font_01_sfnt_off0000ffe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 12108 bytes
SHA-256: 03251da27bcaa112b22a4f1f4140e79b754bf1cc24f276c7ca1457de783203ab

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