Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b69182a73edb51…

MALICIOUS

PDF

75.4 KB Created: 2021-09-13 21:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f35cdc32eba55dd6fc4941537d98518 SHA-1: 9176b455c1d088d3a1554f937b5a4d8ded3f1c7f SHA-256: b3b69182a73edb5103610192e75e996a45dfe754637cc20ef94625327aa9c0a8
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to link farms on disposable domains, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/sufezonosonufatav.pdf In PDF document text
    • http://kesherisrael.com/uploadEditor/files/pabatepibukavinilofesopaf.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/datanug.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/4101150274.pdfIn PDF document text
    • http://cosyromania.com/media/file/75476845127.pdfIn PDF document text
    • http://inica.org/files/file///16736967819.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/74882113036.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/gofikavutipenupuxixa.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/foxuli.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/rosogox.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gukezafila.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/gofakoxa.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rixuzikal.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/70857743748.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/85971169642.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/wezari.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/20379276579.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/20025634417.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/tifubokojesevi.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a188fb62bc3225c0f8dc59f1a5437779/bulirematuresilukukep.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/bisirevesibexafodu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8ae5ef86d---nimenijenajibopesubodajid.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/retufademugivodixuwoxano.pdfIn PDF document text
    • http://ailizia.com/userfiles/givekujupiwatefaboxozo.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/58019164950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=four+corners+2a+pdfPDF 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_off0000bf6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6F 10572 bytes
SHA-256: 858995ea53aa35f94bef45bbc1d31be27769a720ecb93b9b947f62942e7eb6b5
font_01_sfnt_off0000d7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B8 18524 bytes
SHA-256: 73f867ee9888b45265d1f36459e7537fe785f8e91974ccc2bd3d508a57f70ae0
font_02_sfnt_off000107d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1