Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1830af8871f6a0…

MALICIOUS

PDF

72.3 KB Created: 2021-09-17 07:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 53e21f680cbaedb5c550d5c2e2297731 SHA-1: 846d2aa0ab2bfc38339912c61951b48491a42066 SHA-256: 8a1830af8871f6a03b921a1089d81d9fd143ee9d7b735f806267fc62764d60c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://nomylo.ru/uplcv?utm_term=hill+climb+racing+2+an1 PDF link annotation
    • http://berallebags.com/UploadFiles/FCKeditor/20210909132105.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/salijejobumobovuz.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/43681512988.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/20355925541.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/70221424318.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/nulikufinexegopekukagugav.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/sugagojoxetolamet.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/88878585371.pdfIn PDF document text
    • http://abwrva.com/uploads/files/bewixabevigas.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630509267.pdfIn PDF document text
    • https://webrobogo.hu/kepek/zagodezisosur.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/pavumeneniluzaragu.pdfIn PDF document text
    • https://o-dance.com/upload/files/42645807533.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/89454905377.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/37189786609.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109080803542866.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/1758447175.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/naneduneduvikegoguwupo.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/58104663320.pdfIn PDF document text
    • http://cosyromania.com/media/file/95751917542.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/safeto.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/gosaxadevaxarowajojoku.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/vozavejutaz.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vokululujukezusiwomaw.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/98911864105.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/73468113100.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/dfc52aaaa0b3d45e15998151e831efee/36411155062.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_off0000b544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB544 10360 bytes
SHA-256: 2aeff2993c438edf8c1664f9868ef706a78ed74ac1b10554cf82ec4352b6f7e5
font_01_sfnt_off0000cc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 17640 bytes
SHA-256: be710a3db7ad50546f37f5a9c62b5dbd67c50ea62118ccc7b59767b67857dcfe