Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3499c83ffe0f7e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 21:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4588f7cefdf98f655cbe8bcb897618e7 SHA-1: a4c070c1dd17be128b07b007928eb82227beca1b SHA-256: 5b3499c83ffe0f7eb3582079eb96a0bd7be8e1dc18d8d7bbad3f7d34c437e58f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and numerous URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=bloons+td+6+mod+android PDF link annotation
    • https://greenvalleykerala.com/ckfinder/userfiles/files/sunizojamiparifovudujef.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/vipireradunamijurokox.pdfIn PDF document text
    • http://vipdiler.ru/files/file/nerolibajuzi.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/52388978839.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/xetivegisasoniratija.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/berebelukadofuzidigo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161323237ae3d6---sakosiberogazaxesejefoke.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/betinu.pdfIn PDF document text
    • https://wittnebel.dk/file/fonapas.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/muwemabowewixum.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f7f9e49432bdfdf5554b97b26bed44f8/semub.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/rawati.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/pegowar.pdfIn PDF document text
    • https://hagabb.ro/ckfinder/userfiles/files/jafuwasegarikufu.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/jawofezatagotav.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/4128689013.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/mokeluneguf.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/93212440085.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/77007987670.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/dofopusiwiv.pdfIn PDF document text
    • https://biocoils.com/img/file/tivijeruseki.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/nuribulexegepumoteki.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/jewumadunaw.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 17632 bytes
SHA-256: 4ac0dd398ecd1c4ebe159b4799da6bea8fd832e2c35f0dc81b4bdbbcf8a3b95b
font_01_sfnt_off00010938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001214f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214F 10500 bytes
SHA-256: c5abb1d51d48bce6ba52137d02df686c1e1c6d5e2c46845a084aeac0043ed4d3

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