Malicious PDF — malware analysis report

Static analysis result for SHA-256 0144519cc7fa2657…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 03:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d2c6da1553da43b6ed27505508f9704 SHA-1: 9c67235d971765c8ce5e0c080296468efe468c4a SHA-256: 0144519cc7fa265779fe632b18b7f9e7292dcac12337c3e8c9c2495d1c36be3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. The embedded URLs, such as http://edumedcare.pl/upload/files/minumojedib.pdf, likely lead to phishing sites or further malware downloads. Although no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://edumedcare.pl/upload/files/minumojedib.pdf In PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/32358364836.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/9694367177.pdfIn PDF document text
    • https://agrando.cz/files/file/kusatosozozineranujo.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/61921421818.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/11096068983.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/kozunadi.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614776b5a1cca---lufawikukejabor.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/xufonotarodeniti.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/61416997441.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/takiribifuzewi.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/10842025897.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/42239892129.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/tawisiselaxepe.pdfIn PDF document text
    • http://pasaru.com/upload/files/37259159222.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/3416205209.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/16732472703.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/wufakedis.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/kebukasonuzoxasalejirirub.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/ranaxirutegevavizi.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/fuwosomerazevadijeled.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/8600758243.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/pusirenupagotomagi.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/88580324514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mac+os+x+timelinePDF 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_off0000d650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 10388 bytes
SHA-256: 1714bdd0c1f86680410d51de9c55b013053738f416c722e2f3f46dc647cf09f0
font_01_sfnt_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EB 17712 bytes
SHA-256: d42a035e180c2e31f38c76003883fb8e2f45cad4e84b5a0a2f84049fbd1e75cc