Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc7f6ea0a649af82…

MALICIOUS

PDF

75.9 KB Created: 2021-09-30 12:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adc591cb77b21f5d422277ce6738eb63 SHA-1: 6dad95dee0201057343a463ede019118bcf39ce5 SHA-256: cc7f6ea0a649af8233888765812932e8a7c3b6d5a817f90a1a4466dd483c8826
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various PDF files, suggesting a link farm or content distribution network. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts, reinforcing the link farm hypothesis. No scripts were extracted, but the presence of external URIs and the link farm structure points towards a phishing or SEO-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://studiotipaldo.com/userfiles/files/sajabuzoxivogusufibi.pdf
    • http://labuchedeberce.fr/userfiles/file/71420824098.pdf
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/vosepamekewuvoradek.pdf
    • http://pusheng168.com/uploadfiles/20210908153804.pdf
    • https://airbays.com/userfiles/file/77589515.pdf
    • http://runnersavezzano.it/public/userfiles/file/sojiratetapilalalezojuwu.pdf
    • https://agape4u.org/userfiles/file/58769014527.pdf
    • https://cfacgroup.com/uploads/FCK_files/file/5438589813.pdf
    • https://loctra.net/userfiles/file/fozuvesubugaxu.pdf
    • http://jogagongu.pl/userfiles/file/fidazid.pdf
    • https://elesud.it/img_pagine/file/99134540723.pdf
    • https://duvanco.be/docs/files/mapazakogefadil.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16150d4ada5e15---77801001560.pdf
    • http://moveworldtogether.com/datas/files/lidegelapoki.pdf
    • http://tomaszfilipczak.pl/userfiles/file/78178978766.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613156b60b1fa---90231492784.pdf
    • http://slsnn.ru/content/files/97283229140.pdf
    • http://lawfirm.vn/MINH/user_files/file/61917480030.pdf
    • http://factorycontrolprojects.com/userfiles/file/89881252786.pdf
    • http://samnakthodrahassob.com/userfiles/file/78963774945.pdf
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/pesumekikir.pdf
    • http://terezmisszio.eu/files/file/51460870098.pdf
    • http://owop.challengersports.com/ckfinder/userfiles/files/31266641244.pdf
    • http://strandedtattoo.info/file/nigogewijijuravurala.pdf
    • http://grafosaleservice.cz/images/fck_editor/file/lolimabutir.pdf
    • http://lnimeina.it/userfiles/files/36434886972.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mod+apk+drive+for+speed+simulator
    • 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_off0000bcce.bin
a2fb0412517ad39fd0683bbd95abba90b55b4d81856cfab397875cacb7f1112b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCCE 10808 bytes
font_01_sfnt_off0000d5ca.bin
0884e3b86d56f1f08d9d64b2864a15169bfa3f893ad6e8aa243a191b738d9fb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CA 20316 bytes
font_02_sfnt_off00010991.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10991 16792 bytes

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