Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5967f7caac03e6c…

MALICIOUS

PDF

88.6 KB Created: 2021-09-16 12:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b93577630f7d255e0733c4d1827325bd SHA-1: 2f9951ba7fbd094439d48e830f0dbb116e8be931 SHA-256: c5967f7caac03e6c95638790a1e63d3646e60aecf43d282e68999b339fb6ba17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://nomylo.ru/uplcv?utm_term=android+emulator+for+pc+2gb+ram
    • https://birsamundapark.in/userfiles/files/zolon.pdf
    • http://mexxeopaint.com/upload/files/videsosuwu.pdf
    • http://clean-ecology.com/Upload/files/velexurokawatexif.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/94706076a22d4095c230e60fb668adfb/32268505215.pdf
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/81144350704.pdf
    • http://cgl.lu/userfiles/files/pifidiriluxunuzos.pdf
    • https://servicepapik.ro/files/jumulosidevubopi.pdf
    • https://braveathlete.net/geektic/files/gelexomobegobisagesuko.pdf
    • http://normel.org/files/upload/file/11643070964.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405173c6ba6---tujemibi.pdf
    • https://kidneystonetreatment.in/userfiles/files/70640402098.pdf
    • http://nanoservice.cz/upload/file/nejulesipebimolekapa.pdf
    • https://thaiahpa.com/flash/files/kaseguz.pdf
    • http://frutapac.es/ckfinder/userfiles/files/73358067627.pdf
    • https://ruta.hu/ckfinder/userfiles/files/91257954290.pdf
    • https://watfordfairtrade.org/app/webroot/img/files/remazoferur.pdf
    • https://dsverano.com/UserFiles/File/59703725115.pdf
    • http://fu-xin.tw/uploads/files/202109040347028547.pdf
    • https://vinamex.info/uploads/news_file/zonexidul.pdf
    • http://www.sandipmallick.com/fckimages/file/77773555368.pdf
    • https://yourwebcenter.com/files/file/sepegivaz.pdf
    • http://whkmradio.com/userfiles/file/fumisokedu.pdf
    • http://hftyby.com/upload_fck/file/2021-9-10/20210910043850420020.pdf
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/92697104423.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/sonotidotufo.pdf
    • https://healthmatters.me/userfiles/file/xusofutopumarasurakofajek.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f721.bin
2f9c249cd633771f1c97bcd4f0f07ab613e30573c835d4a7e982a469b9bc5f02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 11136 bytes
font_01_sfnt_off000110c0.bin
30db90a0b250fa9f4e40261ba49e15b870ec7ba4060d934761702c85ac706a17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 16784 bytes
font_02_sfnt_off00013c1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C1E 16792 bytes

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