Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b82410756bbbce3…

MALICIOUS

PDF

78.9 KB Created: 2021-09-10 00:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 708d51c09dfa268b9fa256b1b99cf80d SHA-1: 15d1c44f6dec9bf466ac0cdb7d7e83e82d9ed441 SHA-256: 2b82410756bbbce3879d6ea0420528805a0eada19467e7bfc6f4a7ac672f6992
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, one of which is `https://archism.ru/uplcv?utm_term=adblock+extension+to+chrome`. The PDF structure and embedded URLs suggest an attempt to lure users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=adblock+extension+to+chrome PDF link annotation
    • http://baraanduliaptti.org/userfiles/file/gulajuxokejizodewuni.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/75056903480.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/17228749710.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/711789970.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/8381292600.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131251b4e53e---90199800757.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/97701650623.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/1434588440.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/39835014972.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/28542192671.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/sasipovujanimaxube.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/jeripesa.pdfIn PDF document text
    • https://digireg.it/upload/58581128789.pdfIn PDF document text
    • http://recrute.fr/files/files/rozipunapogomesose.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/poxejikabi.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/dozepevukazano.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/69139352423.pdfIn PDF document text
    • http://foodchemsino.com/d/files/guzuxuzefisuvip.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/porasudakazorara.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/dereza.pdfIn PDF document text
    • http://viorina-deko.com/images/file/4582870765.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/24547126486.pdfIn PDF document text
    • https://t2sc.me/userfiles/54333340399.pdfIn PDF document text
    • http://krzeptowski.pl/file/32078451467.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132999e3c6f9---jubesiledajoxizot.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_off0000cf57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF57 10788 bytes
SHA-256: 3cfd217e0255fd1272c56a881b2320c3280b93da61fce5a31d5a04065fa783b4
font_01_sfnt_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 17860 bytes
SHA-256: 2c485af655bc3d89f862553f32a664f49a7d180c616b35e588511c31dcaf6685

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