Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7eae6d89f2c90f6…

MALICIOUS

PDF

90.2 KB Created: 2021-09-17 18:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac63abc37e79d3af76407a611ef7fe1b SHA-1: 21d05d226e5953e2d89a25fcf46c97d8a1a13d46 SHA-256: d7eae6d89f2c90f6fc0e11a01b134219b67a78b24a1c2b8d454753e67cd821e8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely for phishing or distributing further malware. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=game+money+hack
    • http://futboltotal.net/images/files/kakufuti.pdf
    • http://eclickapps.in/userfiles/files/ramodoretagoxaladetem.pdf
    • http://hanasushipickup.com/uploads/files/68140935748.pdf
    • https://hoya.hr/UserFiles/file/fonorufab.pdf
    • http://gpe-el.pro/ckfinder/userfiles/files/serotixepiduduj.pdf
    • https://triosms.com/userfiles/file/25765484371.pdf
    • http://zhizhencn.com/filespath/files/20210917044857.pdf
    • http://nicolalazzarotto.com/userfiles/files/43538037623.pdf
    • http://vaynhe.com/upload/files/wisigumiximusev.pdf
    • https://euroroma-bg.org/files/file/35210144846.pdf
    • http://tai-yang.tw/taiyang/upload/file/85533483566.pdf
    • https://fsreloading.com/userfiles/files/lanusemelitefepawo.pdf
    • http://vngo-cc.vn/cooker/public/files/nevuzarezupabegilema.pdf
    • http://www.impactit.in/ckfinder/userfiles/files/jezatamarap.pdf
    • https://geelaboba.dswip.com/ci/userfiles/files/wopuzivugo.pdf
    • http://okwmd.com/upload/fckeditor/file/86375501622.pdf
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/saxukoxaviji.pdf
    • http://sergeybazarov.ru/file/retekewik.pdf
    • https://sukienmiennam.com/userupload/files/fosokoxalegoju.pdf
    • http://zgkimsteszew.pl/img/upload/files/julojipolerurifekitat.pdf
    • http://pomelieagency.com/userfiles/files/52498242545.pdf
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/6692852949.pdf
    • http://denis-lefebvre-services.com/fichiers/file/17805970788.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_off0000fc22.bin
864e53a3afc0bdf5a37030dab1835007a32b0fb925a9be9697b6580a760dcea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 10236 bytes
font_01_sfnt_off000112ed.bin
be776b1e935d436290ffd72d781e1a0ecc9b72b600bfec1d8e949836d71699e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 18696 bytes
font_02_sfnt_off0001432d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1432D 16792 bytes

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