Malicious PDF — malware analysis report

Static analysis result for SHA-256 783df76b56b3d0e0…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 02:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: aeb9661566fb2f154f6b0c841503ae39 SHA-1: 7df5c46b081fd6dbbd357147e67b9e31df8c4a03 SHA-256: 783df76b56b3d0e0b73278e903670a2b83566a9247a2c9c520ae0ab2c8bcf308
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true destination by using many distinct hosts with few links per host. No scripts were extracted from this sample, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nomylo.ru/uplcv?utm_term=download+song+maker+apk PDF link annotation
    • https://5uempat.com/contents/files/88906365939.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/46192416870.pdfIn PDF document text
    • http://weingut-suppan.at/files/fovupevodikiwaxorim.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/nokepovulami.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/83064253326.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210907_8AD4881BDD145932.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/90121431855.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/89227a79f1b84e36466f69b9a4ed9946/vizunorebiwuwezosexebut.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/25327802926.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210903002508_lxnb5m.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/fagedelomujezisivixanirep.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/62223497243.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/57609901762.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/wipukibof.pdfIn PDF document text
    • http://lejuriste.ru/files/file/tenifilo.pdfIn PDF document text
    • http://espokebar.com/uploads/files/migenovibop.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/22116431714.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/runubusozavofog.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/ketaf.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/xilugepabezasedit.pdfIn PDF document text
    • http://kim-clark.ru/files/file/92061670009.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/74861363734.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/99632723979.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/lojitumutigulajuw.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/78126180041.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_off0000e140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE140 10724 bytes
SHA-256: dec61960602893056da2ca2a039fc9a7de10772210013e2aacd84a96b288c585
font_01_sfnt_off0000f9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C1 19136 bytes
SHA-256: 838d0cc83ce1895b73f3b03c34b79109f35cdffbf297072b2df8a6b36172d912

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