Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c0833af57ed7e0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-21 15:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba0fa414007e007d2370da4c9151d315 SHA-1: ed7bc063e4e747b25222f6b659b8f3247478ac85 SHA-256: b4c0833af57ed7e01f0ef46dfa249c0538532924d743f4993155064b96668560
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to obfuscate the malicious links or perform further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=how+can+i+stop+all+ads+on+my+phone PDF link annotation
    • http://3suntech.com/UploadFile/file/20210904013751058.pdfIn PDF document text
    • https://reha.bg/content/upload/file/24535453725.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/wuwanejuruxareg.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/88193173558.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/migurunokevaz.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091320473697.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/wudepu.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/54676262374.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210904005349.pdfIn PDF document text
    • http://selidbe-beograd.info/files/monuwivirul.pdfIn PDF document text
    • https://avflash.nl/upload/files/9517289791.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613841505211c---lulipovarali.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/68699838731.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/vufazexudafomurese.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/99353999061.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/rujegitewedake.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/10178163638.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/3878449623.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/jobuxixup.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/bepusenomolu.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/wuwesuvefosuxijosaweku.pdfIn PDF document text
    • https://seikai.jp/free_images/files/vugarekarizamupifipumivaj.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/pibiduma.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_off0000dec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC2 10872 bytes
SHA-256: 2034016a93c8161ab0f69cb3a7fb3ec48cb078136211a9f7d6d01c3dac0b888a
font_01_sfnt_off0000f7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B6 17740 bytes
SHA-256: 758282b0cd1a3680aa77ad0806adbdd0bedd57407e1eeb15cbfd4aa107d3c129
font_02_sfnt_off000125b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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