Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cedd62c21327dff…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 03:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2608f0a88361745b5479e94efa43a6b3 SHA-1: f87fe8f2a9185f2b9738a765359404b9be3e519e SHA-256: 3cedd62c21327dff2b6fa68439435275f1909cd1af111891d20892a8c9a19fed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on low-reputation domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics suggest it likely attempts to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=pokemon+black+and+white+zip+file+download
    • http://pedraferro.com/files/files/vekigovux.pdf
    • https://zapcdn.space/web/img/podborky/files/4963906326.pdf
    • https://shevtsov-art.com/uploads/files/voponenaxujofikoxosega.pdf
    • http://veterinariomauracotti.it/userfiles/files/92110402410.pdf
    • http://bright-mineral.com/uploadfile/file/2021090215524441.pdf
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/nugaxegomoxorezotuwowox.pdf
    • http://ks-system.co.uk/ckfinder/userfiles/files/rexowonivujofaloseperu.pdf
    • http://abwingssuffolk2.com/uploads/files/57474833303.pdf
    • http://ibtaker.ps/userfiles/file/vilinusidipofu.pdf
    • https://bdblue.com/ckfinder/userfiles/files/12140225780.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/17c3f8e1b16f3b9a8abb26331d5142e3/16974615754.pdf
    • https://hbphoto.ca/resimler/files/lopiwilinigadi.pdf
    • https://illustrations.noche.fr/images/files/nagolasofevimujapegamipar.pdf
    • http://www.siposferenc.hu/html/28331105276.pdf
    • http://wgadget.com/file_media/file_image/file/gibazobitoxurukawi.pdf
    • http://arenabilardo.com/data/_files/86537305501.pdf
    • http://missteenqueenuk.com/userfiles/file/49597614785.pdf
    • http://mastrodibaglio.it/userfiles/files/41529771409.pdf
    • http://ukkies.be/userfiles/file/87040177122.pdf
    • http://logicamail.it/draft/media/penewodaminuturazeromo.pdf
    • http://labuchedeberce.fr/userfiles/file/28193950256.pdf
    • http://avatars.ru/userfiles/file/diniribexuwebukesoner.pdf
    • http://apexibd.com/uploads/fck_uploads/file/51559448416.pdf
    • http://nenkin-t.com/upload_img/ck/files/bugonejojumazapunizuwu.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_off0000e325.bin
4103ce5176ce1eee814726bf5f5c611bdc9bf5783e1423ba14dc4d476f93b9a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 17420 bytes
font_01_sfnt_off0001105a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1105A 16792 bytes
font_02_sfnt_off00012871.bin
19e871104010a0e72a9341162eced93238e3d578e25fe25833b7e79d5dd40193		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12871 10996 bytes

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