Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61df7e3e822c63a…

MALICIOUS

PDF

73.2 KB Created: 2021-09-19 06:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b0a35f285a48d50f248d6a8248143de1 SHA-1: 32c9841dd718e5198e2225ab29f0edcf69438f2f SHA-256: a61df7e3e822c63ab14a6e58d4d1eea92643db68a42193a8650b1651b2c75e65
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm structure. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user, aligning with phishing or malware distribution tactics. The numerous external URIs, many pointing to PDF files on potentially disposable domains, further support a malicious intent to host or link to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pastelbuilders.com/userfiles/file/74722298933.pdf
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/neseno.pdf
    • http://logicparcel.net/uploadsEditorfile/76458011024.pdf
    • http://mutamobilya.com/images_upload/files/rusavigu.pdf
    • http://imdad-egypt.com/userfiles/file/34149856690.pdf
    • http://eikenhorstgroep.nl/userfiles/file/miwesotekezeloje.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/melawoputatikedexexa.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef0f5a96e6---60479467784.pdf
    • https://mirrorlink.com/public/files/files/suzizepaxoxininenosi.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/zeborurosu.pdf
    • http://candientu24h.vn/webroot/img/files/24288745581.pdf
    • http://cwesp.biz/upload/file/wekukijuvuxotatozewixifev.pdf
    • http://osingenieria.com/images/admin/file/fulawuxuj.pdf
    • https://medsplus.us/admin/images/file/57555284179.pdf
    • http://ceramvetro.net/userfiles/file/1911618458.pdf
    • http://vuason.vn/upload/files/sogoluvedilunovireroruwuz.pdf
    • http://murasakijr.com/uploads/files/bovaduja.pdf
    • http://24cvety.ru/upload/files/zamarupezufiganipe.pdf
    • http://efuturesthai.com/uploads/files/rugojonukabobuboripa.pdf
    • http://drivingschool-brno.eu/files/54167282534.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b91e900d07---13074095070.pdf
    • https://2winit.com/Files/files/wivapusirozize.pdf
    • https://dichvumayphoto.vn/webroot/img/files/satunonekebisikenobiragu.pdf
    • https://airin.lv/images/userfiles/file/40538408645.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=tiktok+verified+symbol+copy+and+paste
    • 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_off0000b927.bin
e60ead22ef6cc658862c08a4e0efd6da53e78252570b9ced9abbb4e7de560af7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB927 11156 bytes
font_01_sfnt_off0000d31a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 16792 bytes
font_02_sfnt_off0000eb2c.bin
7dbb6a4f7662ca1147ba9fab2c57b7c544d1ae7cd9377277c0fb8ebbd47ade86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB2C 17432 bytes

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