Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b6b2ac25d3af15…

MALICIOUS

PDF

73.9 KB Created: 2021-10-06 10:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 19c8e2d3764d972b7882ca392b17b3d3 SHA-1: a7bd30e8a9e83af685e99fb645ace57759ce3819 SHA-256: f7b6b2ac25d3af152f871a2ed1df769a776334db293f0552774a776d8b27a644
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as link farms, a common tactic for phishing or distributing further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://pixomot.ru/uplcv?utm_term=blanket+pardon+meaning PDF link annotation
    • http://e-store-sys.com/userfiles/file/76482561238.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161505e225e260---zananuvup.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/81463498634.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/taxanugodu.pdfIn PDF document text
    • http://1carl.com/userfiles/file/lojebonux.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1614e985556079---44859251025.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/39051248484.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/xalel.pdfIn PDF document text
    • http://aweibel.com/Photo/file/fudofivifanizuw.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/redibun.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b4f5def1f40efb400756c176235665ad/33491959667.pdfIn PDF document text
    • https://badoza.net/userfiles/file/44851277529.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/71645205650.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/74802626871.pdfIn PDF document text
    • http://strap.sk/uploads/file/penasokoboxovabokig.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/mutukizusinobutaji.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/newasamozosunorawex.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/55935587116.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/28399548380.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/76964136411.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/94140713009.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/66585648847.pdfIn PDF document text
    • https://transdeliveris.lt/userfiles/file/11197518852.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/94692474152.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/fitizenuzopedegasabufoga.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/nabazedasavusorurul.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_off0000bde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE3 17264 bytes
SHA-256: f35ada950728582d24405c9024b899855ed38eb34889ccd8513ecd09831b1663
font_01_sfnt_off0000e9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F5 10712 bytes
SHA-256: d6d76dda98e13c1d6b1c05068b65dc04bd2d53a43101452b2668efa7b002ba81