Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50d2914d86797c2…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 20:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b3979e4c8f365bf76a37fba9692d26d SHA-1: de4126daaff8923ce7289819a1cbdc9dfb6451a6 SHA-256: f50d2914d86797c2fcbbd5abc0475faf5e4e7f393420d11a3b2822914e5aa441
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210901175527.pdf In PDF document text
    • http://henseltech.cz/userfiles/file/37511633944.pdfIn PDF document text
    • https://alaqart.atelierleuthold.ch/userfiles/files/94785889572.pdfIn PDF document text
    • http://santeh.md/img/files/filiziwabelojivu.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/tugelegozilogaf.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/jufevoziserurixolazanon.pdfIn PDF document text
    • http://netdepphunu.vn/images/userfiles/file/povifirexusuru.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613674384665f---mikekipuvasokixumasuba.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/6990443465.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/nefim.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/79905963301.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/pesonuluj.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/5256746142.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/22380149025.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/24200948005.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/taravezadob.pdfIn PDF document text
    • http://orderkai.com/uploads/files/saxawukosibawenuzijari.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/mafinokijiro.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/voporesipulejepeg.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/57913449719.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/53549595969.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16139ca4af0cea---74830887501.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/50801981272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dialer+themes+for+androidPDF link annotation
    • 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_off0000d747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD747 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 18132 bytes
SHA-256: 4c17100a64d7af1008fc2688389b399eb8a33c13d23b2d69cfc13d965d9f377a
font_02_sfnt_off00011ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 10620 bytes
SHA-256: 30dc263a9ddbf397e8833dad82c4c7f0aa1f123d2e6b1d64f63907d774eb9a87

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