Malicious PDF — malware analysis report

Static analysis result for SHA-256 37618de3163ae2ad…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 04:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e9cb20b0dbb04e8ead2cd1b707907ef SHA-1: 51688949eae5fb075c1397920ae082bf8d084e4a SHA-256: 37618de3163ae2ad4ba261421a2bfc397ca1e787ee04ddc31ef50f2dcb9549d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a link farm, likely intended to redirect users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior. While no scripts were extracted, the structure and numerous external links suggest a phishing or redirection attempt, hence the classification as unknown family.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0de9d5a01---fefunumavixugumefuk.pdf
    • http://printrun.nl/userfiles/files/37633596007.pdf
    • http://test-immo.com/file/62837404120.pdf
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/nipogagamexosipumuvixez.pdf
    • https://tidaksusah.com/contents/files/1324404037.pdf
    • http://sllight.ru/design/img/upload/file/87281167674.pdf
    • https://imotrading.com/images/userfiles/wogoregixoz.pdf
    • http://ledins.lv/cms/file/87299167163.pdf
    • https://bandotrading.it/uploads/file/nidewedurominogoboxaxirum.pdf
    • https://dbhattacharjee.com/ckfinder/userfiles/files/bogovodoxarususimisusuzu.pdf
    • https://grafconsulting.pl/Upload/file/45911877816.pdf
    • http://nakakinpump.kr/fckeditor/upload/file/welamusu.pdf
    • http://year-c.com/upload_fck/file/2021-9-10/20210910192950767964.pdf
    • http://yujinpharma.com/upload/files/jugudavijiluxivaza.pdf
    • http://itkaufmann.com/images/fckimages/file/92926934693.pdf
    • https://siangyun.com/upfiles/editor/files/lexoguzesiba.pdf
    • http://195exim.com/datas/files/duvadujode.pdf
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lonoposonureselusugaxo.pdf
    • https://dehayemek.net/upload/ckfinder/files/fawaribojidekuxomowowilo.pdf
    • http://spy-military-labs.com/userfiles/file/28831540817.pdf
    • http://studioingegneriavaragnolo.com/userfiles/files/pipezelokojalun.pdf
    • https://ambient-interier.cz/files/files/74246599764.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d247f1072---tikevakadadu.pdf
    • http://nhatrangpalace.vn/app/webroot/upload/files/jidemidajul.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=galaxy+s9+vs+iphone+12+pro
    • 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_off0000da73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA73 16792 bytes
font_01_sfnt_off0000f28a.bin
5daae7dcd349da5935adcf6e762fcc40a56b3c138fd39a5bd8c2dbcbb3114d36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF28A 10912 bytes
font_02_sfnt_off00010be9.bin
20b323c3f7d363e8a00ed163f0e67535ff23c4a2c0fed44566c585f6a77ceccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE9 19360 bytes

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