Malicious PDF — malware analysis report

Static analysis result for SHA-256 6145bfa931ab3b46…

MALICIOUS

PDF

101.0 KB Created: 2021-09-17 12:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a511e7d502f9b41b3154a12a6a0cb1a4 SHA-1: 7f41b0584450f8302acfcd86168966cb99f9c013 SHA-256: 6145bfa931ab3b46f47e6cea873b2fe3486d3db8bc4f6eecdbb35dda259b358a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable hosting and employing UTM parameters, strongly suggests a phishing or link-farming attack pattern. Although no scripts were explicitly extracted, the nature of the PDF and the embedded links indicate it is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://medvor.ru/uplcv?utm_term=die+hard+123movies PDF link annotation
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/176b20d5ccaf9be1a58b1b790dbcdb5c/54138529168.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/94403646347.pdfIn PDF document text
    • http://karczma-zaborow.pl/userfiles/file/burubuzu.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/duwuzakirevamavud.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/80912728923.pdfIn PDF document text
    • http://netflor.pl/upload/File/63942144896.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/163158352540477bc2adceef4d2c90.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/73930724518.pdfIn PDF document text
    • http://sdes.in/uploads/fexadamuxuset.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/43212145002.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143a2f940a4f---78877896418.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/24068977513.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/34769417333.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/66834730530.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/69117679660.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/nuwejowudi.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/wusadogumaxiko.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/94030560119.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/kovexowinadinudidogir.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/64083103493.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/mabelagodababudo.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/70291420741.pdfIn PDF document text
    • 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_off00011fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD0 20156 bytes
SHA-256: 1d4975fac0c5f163ac83e8e7b196ea6f6f08c545b699783868437634fdf768e1
font_01_sfnt_off000154e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CF8 10676 bytes
SHA-256: 80f0b1c51989e2cd906f7a3c2b9819d26ee7a47938f92ae5cc3521f4beeaf003

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