Malicious PDF — malware analysis report

Static analysis result for SHA-256 9064100bd02ec8d2…

MALICIOUS

PDF

84.9 KB Created: 2021-09-22 09:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e92c364dc21ee2eba7e902413d563de0 SHA-1: 933acebada1a4f496a21ca14229344e08ae9ef61 SHA-256: 9064100bd02ec8d26d9e23ee19cab8a6a3c0ec2ad348fb7698e514162e41255e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flagging it as a link farm on disposable hosting, suggesting a phishing or credential harvesting campaign. While no scripts were extracted, the structure and heuristics point towards a malicious document designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://kerryparsonsfoundation.org/media/file/zamuwudanoluxorubiwor.pdf In PDF document text
    • http://delfosventures.net/userfiles/files/ridalarorokazarenon.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210904_063116.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/12895809105.pdfIn PDF document text
    • http://apart1day.ru/file/76955596854.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/xoresazoralimozo.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/jebonaragexikanefosika.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/mojezamezik.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/20353094881.pdfIn PDF document text
    • https://tigapilar.com/upload/files/36517797547.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/93703336324.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/kewakovix.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/12202507415.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/44365239444.pdfIn PDF document text
    • http://marathonlaval.com/userfiles/files/tinovupofulaje.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pakavorur.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/4192162583.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/33178320480.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/87862848756.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/sijesagisidibogetupi.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/eda451143f3e254520af6b6adfad6236/77126339798.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161313e5c0fe06---11356638020.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/51743100122.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/diwim.pdfIn PDF document text
    • https://kapefashion.com/files/files/83737045694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gtv+bangladesh+livePDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210915/16316903526060.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFB 10552 bytes
SHA-256: 82ade43e8a7330e5a3be1f9de3edf87383dbcd586f7e149a4a9de96dc5c4a6cc
font_02_sfnt_off000114ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CA 18792 bytes
SHA-256: b3a020dd510a96f7eee2525e1505583a89abf9df1269efccce3c9041e2d768c2