Malicious PDF — malware analysis report

Static analysis result for SHA-256 e08e58277588d07a…

MALICIOUS

PDF

85.7 KB Created: 2021-10-13 11:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 102b0f3d95fc295bcbd6a089ada62f88 SHA-1: c0bb967e0631078f4d232a9017c8ce177a11adde SHA-256: e08e58277588d07a14899bc574920eacdbdfe464fe4dc8a4497b41e980b1d168
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. The heuristics indicate it functions as a link farm, with numerous distinct hosts and embedded URLs, suggesting an attempt to redirect users to malicious sites. While no scripts were directly extracted, the PDF structure and the nature of the embedded URLs strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://gintaras.cz/userfiles/file/64317214000.pdf In PDF document text
    • http://borik.customreal.sk/data/files/3084419307.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/deronupanideleniwugimot.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/99681654985.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/42946664179.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/genajozekufuvur.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/35329947446.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/lereragodovofulupupisu.pdfIn PDF document text
    • http://umhouses.com/uploads/files/18693822356.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87f948ffb3fd417cb92bcb13828a1565/pidapurim.pdfIn PDF document text
    • http://vaynhe.com/upload/files/97240659714.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/tinixotewa.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/71920751102.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210922141316816.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/lanupoxalonituvegasoruduf.pdfIn PDF document text
    • http://nscenter.cn/upload/files/wakisadit.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/bexowusisiginafivunoved.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/17278286767.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/pupafe.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/16540197542.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/60343744286.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/17490056208.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/gotijofufaniwinozegepo.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/tiwupexi.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/6066156126.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BcFPVxLj4jw/uplcv?utm_term=to+burst+someone%27s+bubblePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE006 17920 bytes
SHA-256: e8d998d815683ab43e4b5b88c0de8531186e8c803417cec3d2b5486c55a9bda5
font_01_sfnt_off00010e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 2044 bytes
SHA-256: 97a693020a9c67c913fa5abf5d83a61848c846aa130c5182d8e66f233602b60d
font_03_sfnt_off00012fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD8 10252 bytes
SHA-256: b3566590f86273b6918d9160cfa7ac3ca1916bdae4b1dcd3eeb77e4b733cafbb