Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d02fb65e45d316…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 02:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81f339de618f33a00ff0c0fccd09b6ae SHA-1: 3814ee4b09645b0a6a5dbf7b5eacff435cb104bc SHA-256: a1d02fb65e45d3167f0ce1eb0fbfacd91136e9568da1f88602abf791a215c5de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://buzascsaba.hu/userFiles/file/femapuzujupot.pdf
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nenolifexex.pdf
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/14122572415.pdf
    • http://hglobaltour.com/FileData/ckfinder/files/20210905_DA6C3FD8D8B83BD7.pdf
    • http://kamakuralosgatos.com/uploads/files/bexodomed.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388cf45a548---97049397697.pdf
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fakepasufulo.pdf
    • http://www.macrolepidoptera.hu/userfiles/files/77473661627.pdf
    • http://www.morrisjones.co.uk/EditorImages/file/jedorilupuperikawowag.pdf
    • http://alrabbancapital.com/file/files/mexulowu.pdf
    • http://elosc.com/upFile/file///ITX202109101531155599.pdf
    • https://durimawar.com/contents/files/45554334897.pdf
    • http://bualuang101.com/backoffice/upload/files/wobujuxigolezezego.pdf
    • https://nidi.mk/ckfinder/userfiles/files/43275996534.pdf
    • http://henca.com/files/details/file/83490078943.pdf
    • http://itexpertdog.nwoasis.com/upload/files/44643409702.pdf
    • http://bk-plus.at/userfiles/files/jukufetilodapi.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/31946782932.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/96406022ed02724c65ae9c25206e360d/dinelibewafesapeduven.pdf
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/lifoz.pdf
    • http://stagelight.pl/userfiles/files/66565214910.pdf
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/39891204845.pdf
    • https://btcauction.vn/hinhanh/file/67594427967.pdf
    • http://sva-jeanroze.com/xmedia/file/nanejedogowegam.pdf
    • http://ktcyy.com/ckfinder/userfiles/files/45638887832.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/28309846233.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hotstar+latest+version+mod+apk+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da90.bin
37f52fc4064d3308bbfae6a97ec397b513f3d45f9bd2ee8483fa06f8baae4b25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 16544 bytes
font_01_sfnt_off00010505.bin
b9c612bdf89a84e6afedf0946660d1ccf4ffacf7db148bf9ff6ed05a4ab5b7ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 10788 bytes
font_02_sfnt_off00011dd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 16792 bytes

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