Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f239f1653699878…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 09:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07830435a59da5eb44adb9226d0b9dd3 SHA-1: 5a87cbdbc2a3bf57cacc389df45436e4db6ab5a3 SHA-256: 5f239f1653699878a35398e2ec5185caa70ea15c6c42faf69665b406a5fe0f17
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or used for hosting files, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 https://allytemp.ru/uplcv?utm_term=language+translator+api+for+android
    • http://triatlonbizuterie.cz/sites/default/files/file/19563255353.pdf
    • https://cicimanis.com/contents/files/53704104956.pdf
    • https://konyaalotaksi.com/userfiles/file/fofilezosagodaxafuzi.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a22fd4e070---wokebezonabe.pdf
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/63439005174.pdf
    • http://yacpa.org/yacpafiles/file/dubawugefaroj.pdf
    • https://parlagame.com/calisma2/files/uploads/84054894898.pdf
    • https://nhomphuongnam.com/upload/files/1799643684.pdf
    • http://www.rajpuc.pl/pics/file/sakabuxonep.pdf
    • http://hotelpenza58.ru/ckfinder/userfiles/files/gajimuxamezej.pdf
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210904025006.pdf
    • https://wigs4less.net/nbloom/fckuploads/file/zuzufabare.pdf
    • http://vitalbafitnessclub.eu/userfiles/files/fazebapogusixapofi.pdf
    • http://skontrolsengineering.com/file_media/file_image/file/fozobox.pdf
    • http://studio-orlandini.com/userfiles/files/79053254663.pdf
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/74710522739.pdf
    • https://easy2ticket.com/upload/files/72652477664.pdf
    • https://drlalashow.com/php/billboard/uploads/file/dapakoleverufekum.pdf
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/19339558605.pdf
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/66265475364.pdf
    • http://sky1981.com/asset/uploads/files/15190995812.pdf
    • http://www.cafeinca.com/img/public/contenido/file/12168034906.pdf
    • http://sjar-tech.com/uploadfile/file///2021092005284335.pdf
    • https://ladymamashop.com/uploads/files/202109010124434718.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/84578983052.pdf
    • http://daiichihr.com/uploads/news_file/rewoguvenudulunopo.pdf
    • https://motoquadro.de/userfiles/file/69045246187.pdf
    • 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_off0000d940.bin
bfb97859758cf505de06a50f4a48f97bfdeb8f7fb6af9254f8b7dd620d151f17		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD940 18756 bytes
font_01_sfnt_off00010aca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 16792 bytes
font_02_sfnt_off000122e1.bin
7ad440da4ea7814454720bddc8e6e9babaaf1786f8a8c4e1c400fcfaddec9447		 pdf-font-stream PDF embedded font (sfnt) at offset 0x122E1 10728 bytes

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