Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb0c29cd6544382…

MALICIOUS

PDF

85.7 KB Created: 2021-09-21 17:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc0c645482fa42871c6214493826522d SHA-1: 034d7aa9154834a149e513fe00adc30420034180 SHA-256: 4eb0c29cd6544382a9b44edf9a3bc617de2f30b514aabcc55616e083fd070537
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, suggesting a phishing or spam campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination or distribute traffic. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristics strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chieucoingason.vn/files/49265865653.pdf In PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/kexavejidobesodusewuj.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/vixikebomoreveguk.pdfIn PDF document text
    • https://conrays.ru/f/data/zepav.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/putulezo.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/2537747704.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/lisisokirufexegaza.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/taxamojuretiwivipalivu.pdfIn PDF document text
    • https://rakbah.healthybitespk.com/alpha/ckfinder/userfiles/files/wadakofolamawodid.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/xadixawubagusafetidoxa.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dujipunaranuv.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/72636958729.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/33611979997.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/lidevegekiritogoluwu.pdfIn PDF document text
    • http://hejia-ele.net/upload/75023709959.pdfIn PDF document text
    • http://lg-palette.com/upload/files/ruforosukuduno.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/fadunanapibi.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/degududixejizadusi.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/xuxikasapadusugozi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/42116471fe3d58b2916d0babde2ec434/56801751822.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16146e5fdee0fb---vabosifaraw.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/76363503155.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/kipinuvilijofelowonujeso.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/nibezinivejojunob.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210905233159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pk+xd+mod+apk+unlimited+money+and+gems+2020PDF 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_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 11284 bytes
SHA-256: 8acd9bec50680a39a6cfaaac96469ac508c3009bbc23e464c2da0f97c148706c
font_01_sfnt_off000101eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EB 18032 bytes
SHA-256: 1ac1ff86ea1650a4689838d62b8fffe71507a3caec052999d41dbc74d71d6e08
font_02_sfnt_off000130b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1