Malicious PDF — malware analysis report

Static analysis result for SHA-256 13518f57d6cef305…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 09:43:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8a40c3d064e97a3c96654f83fe8774e SHA-1: bc9b7e76e04bbae423fd55a215cdeb15eda792a8 SHA-256: 13518f57d6cef3053831fe5d91a7e0c216c9de427b7f393a22dc6d04cb9c665c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to files hosted on various domains, suggesting a link farm designed to distribute content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the presence of many distinct hosts strongly indicate a phishing or malware distribution attempt. While no scripts were explicitly extracted, the ML classifier and ClamAV detection confirm malicious intent, likely through embedded JavaScript or exploits within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://grotech.in/userfiles/file/jafujinagozawebufoxi.pdf In PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/maset.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/893401479.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/vexagavurofipizo.pdfIn PDF document text
    • https://tsegypt.com/file/15625388245.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/96161053375.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/52310430734.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/dirosipiwaxu.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210918_155213.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/39957861214.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/dubosutekuripepajaliximop.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/18026921272.pdfIn PDF document text
    • http://soles2walk.cz/data/file/jadifavexuvepizawegibip.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210907_043025.pdfIn PDF document text
    • http://ipceurope.be/assets/file/37229345783.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/8927682426.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/45672969316.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109190905247898.pdfIn PDF document text
    • https://ebooksweb.net/files/file/keferubatatijikejo.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/77292756329.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/61600038907.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/wuginadenadom.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fccd9ac0f2---16396937590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=metal+slug+game+download+apkPDF 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_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 10812 bytes
SHA-256: 0e1e20df1949da07f3b384d3a79a35438e914e0fcf75b9f5179766730b88151c
font_02_sfnt_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 18092 bytes
SHA-256: 3411fdaa915ca05aa3bf12b2c02dba8add2348b4d9ca4afc4aeafd3826481097

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