Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5533a681d657a78…

MALICIOUS

PDF

72.1 KB Created: 2021-09-09 03:51:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb2d958c6e1b6f32db6039454d36900e SHA-1: d1a5c273a2406b0db1eb79cda85e7cde7fecfc4c SHA-256: f5533a681d657a781844a3979e9a176924164d47b51f2382a3a25b6330265d20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://adacu.org/userfiles/file/20210901215703.pdf In PDF document text
    • https://csp-pub.com/stockages/files/jabokutowuwosugifiwe.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/zudojilevutolowe.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136f53466ad1---gezatixezobexima.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/17514502807.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/7927768861.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/23142441041.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/77194237380.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/ditinufabejuxejubexotaz.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/pebanorununiraboxofet.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/77181660502.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/75069596722.pdfIn PDF document text
    • http://taigesw.com/upload/files/vasugilepetoxujiwi.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f09a2f619---girelazulonefival.pdfIn PDF document text
    • https://lapakunited.com/contents/files/97043595545.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/50632564037.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/fekojewakasutejen.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/kegitinorixew.pdfIn PDF document text
    • http://gt-outillages.fr/ressource/site-image/files/gimidupuzurilogozenagebo.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/bavak.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/tinasamamikiwovav.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909083230.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/69878870391.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/jekulorurizudifajomem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mod+and+hack+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_off0000b930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB930 10212 bytes
SHA-256: 29f8a8f03fa9ef09b95a2a165439b5184e1e734ba959c62a612e02d4af4405e7
font_01_sfnt_off0000cff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF0 16904 bytes
SHA-256: 4029429431cbe719b15eeeb32d0c6b16fbedbd08cc98b4ddd0c6d870762a3377
font_02_sfnt_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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