Malicious PDF — malware analysis report

Static analysis result for SHA-256 20deb9c59ed61d27…

MALICIOUS

PDF

84.6 KB Created: 2021-09-21 16:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fcf11f8fa7e90cc304c156ad97f9e44 SHA-1: d114291f142fbe0bfdbd44059f8d38c6308eeeaf SHA-256: 20deb9c59ed61d279c2df2ccaf1d530e00d3f4f32856e3936769be5b7c40a32a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://huntic.ru/uplcv?utm_term=3d+live+themes+for+android+free+download PDF link annotation
    • http://holzbau-napetschnig.at/3810575550.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/roregosemi.pdfIn PDF document text
    • https://x-software.cz/data/file/pusasoxoduvusunixideveru.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330c8e5267f---busatafidudiwez.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/xajajiweluzarulap.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/xigupize.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/nilugozuzepejuno.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/47440888532.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/gazajufujawijon.pdfIn PDF document text
    • http://protok.pro/upload/files/puveloruxemuja.pdfIn PDF document text
    • http://wiskind.com/filespath/files/20210920161820.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/rikemegojuvopudidasibe.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210908_1EA24A44F6479F56.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/68188529216.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///goguseriramadesene.pdfIn PDF document text
    • http://dgjst.com/upfile/file/36893703370.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/zewofimebikuragole.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/nodaditisiraxenogod.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/42358205185.pdfIn PDF document text
    • http://mp-journal.com/media/file/77086784561.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/tuwaw.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/60267182401.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161467acf93fcb---99973694544.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/24380102747.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_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 10848 bytes
SHA-256: e6d2a6e6b61c406bbae204d6f7b359c3f21b8dde3cc37753565490bd13c39858
font_02_sfnt_off0001167d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167D 17780 bytes
SHA-256: 13ae78f498964c160caa365fb46af19c630bf16823180ebad1a2f0021741fe1d