Malicious PDF — malware analysis report

Static analysis result for SHA-256 8762e5f2f45b6394…

MALICIOUS

PDF

73.6 KB Created: 2021-09-19 10:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6c8cee8d127d3c5ab2f62ffd043ef4cc SHA-1: 444ca2dea71b93939ed27d9d348ca8f0279d796b SHA-256: 8762e5f2f45b639404489d56642d42131d36b932af41e4ac09ef8ab91a55ba4b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm PDF. The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://angerdress.store/ckfinder/userfiles/files/19863477183.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nedekinasezabe.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/77947135580.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/xilufomusu.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/kebovexan.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/wapani.pdfIn PDF document text
    • http://fourfoods.com/images/files/31929053160.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/92478123959.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/41305569994.pdfIn PDF document text
    • https://dellrein.ru/content/file/zikaxitizofuvexaxumim.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/xuwedilowuxukow.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/22212699959.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/19502278747.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/52382211027.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130972d7f80d---87698031750.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/besozojupojutejogosok.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/63126943695.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/jukaw.pdfIn PDF document text
    • http://batdongsandothanh.vn/luutru/files/22597733459.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/togadabusatasitan.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/bokinipabujuxiso.pdfIn PDF document text
    • http://decorstore.eu/upload/file/folovakemifipimujabepek.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/ninejegawekaxagujuxiz.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/54424144064.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/guzoki.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/kanew.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/zuguritipekikenurodaman.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=10+letter+word+beginning+with+pPDF 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_off0000bbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFB 10644 bytes
SHA-256: 1f66a2333199a4dbeefec9ade7e001d8d23458cee75aab34931d3b80e6312dcf
font_01_sfnt_off0000d3c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C6 17240 bytes
SHA-256: e28d14caf38bbc525aef7b50508fc3c4085768d08ec37344dada71d3ea4f5c2e
font_02_sfnt_off000100f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1