Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f59afea502b9a6b…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 18:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 84df1824458ea986e421824e35a8b557 SHA-1: 21396834de11b27ee8de2374575d6ed8ffffb37f SHA-256: 7f59afea502b9a6be3bb8f0c5fd92bbcd5f0f74540fc271634b279436d0f2280
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm designed to obscure the final destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting a deliberate attempt to obfuscate malicious links. While no scripts were explicitly extracted, the nature of the heuristics and the embedded URLs strongly suggest a phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/kinaxuvu.pdf In PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/86032799569.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/kizegokirixamumatudumutid.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/36066267893.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/xaxuvaxonokinef.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/bisoburonopomegulotijegug.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/rowuj.pdfIn PDF document text
    • https://penzion-palice.cz/content/31820314283.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210903_63D74F7BDA483224.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/josugotigupibanedenekefes.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/foxufenoluwawu.pdfIn PDF document text
    • http://saktigroup.in/uploads/wozinixa.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/safefivujekarukefawaxog.pdfIn PDF document text
    • https://mcsfood.com/images/file/manaxemuvirezugut.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/91432096257.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/76c0a0ced5af471140823444e3ee3d92/xixuwobusoguxisev.pdfIn PDF document text
    • https://artbynela.com/uploads/file/jokimanuluzikifinokif.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/temisexizalijizukoj.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161347666dfc7a---81340121033.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/tixonatidezi.pdfIn PDF document text
    • http://egitara.com/upfiles/files/29244236634.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/34857960.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/80519254449.pdfIn PDF document text
    • https://mimpidia.com/contents/files/19001940438.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/baxexedaxagenuzovupuka.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/betikizofiwopeso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=note+8+charging+issuesPDF 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_off0000e008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 17056 bytes
SHA-256: 80a4476ed1bce5325c49ba74278c2f6ab1d23f41cd23a9e79bb41c0337f74fa9
font_02_sfnt_off00012401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12401 10748 bytes
SHA-256: 6b6ccaee2acbc00d9773140cc24fcc295152916ada5a53f94cfe58a19227f8c1