Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee7de35db117f88…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 00:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 825c9ad2edd6220e5cbee8fc9a6a5766 SHA-1: a26882d22a5f9c4582c6be74dd16c995ff5d0b2b SHA-256: 1ee7de35db117f88e382e71f8bcefe2571991b3fa255fb571921e5bd87250cac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, many pointing to suspicious domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a pattern of disposable hosting and redirectors, commonly used in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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 http://szyuangang.com/UserFiles/file///kikovadumu.pdf
    • http://kammerchor-lindau.com/file/15016845272.pdf
    • https://felicitareonline.ro/ckfinder/userfiles/files/64143642391.pdf
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rojutojezubedu.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139265b3af06---8029674116.pdf
    • http://beiwendq.com/userfiles/file/mefifotamotiwofaxewezu.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/mumefepitazawodusuruneke.pdf
    • https://mimpishio1.com/contents/files/jikatenolanuka.pdf
    • https://bestrecycledautoparts.net/images_i/file/bupekowadorujusopegijado.pdf
    • https://fong-cai.com/upload/files/nenokawelewimexopujanuf.pdf
    • http://csc020.com/userfiles/file/20210901161717_d5j2w8.pdf
    • https://magnettoptan.com/upload/ckfinder/files/xumoriwogelafu.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161421786bc250---27714715824.pdf
    • http://dentherapia.hu/files/file/21000471710.pdf
    • http://kiuanai.com/userfiles/file/73166823616.pdf
    • https://rcvizovice.cz/ckfinder/userfiles/files/5111478618.pdf
    • http://gimhaejazz.com/fckeditor/userfiles/image/13917236261.pdf
    • http://shahnawazonline.com/uploads/files/68651797228.pdf
    • http://digitalpolicycouncil.org/imagenes/file/82517681826.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/1524570195.pdf
    • http://pepinieres-soupe.com/userfiles/file/39286996408.pdf
    • http://axi-hohenstein.de/userfiles/file/rijelov.pdf
    • https://aitalk.vn/upload/files/zukaranawufigiragop.pdf
    • http://abpaluso.com/upload/file/fejafetinebafawimur.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=apk+pokemon+go
    • 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_off0000d932.bin
0a429c59f96943721cdaff4ad824adfdb953e7597cdaa58c9a8deb7215348482		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD932 18076 bytes
font_01_sfnt_off0001081d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 16792 bytes
font_02_sfnt_off00012034.bin
bddc1119dfc431d5131b23052fe2dd0eb97b088b39248e287589b0af65c32445		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12034 10004 bytes

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