Malicious PDF — malware analysis report

Static analysis result for SHA-256 537114b45870dfe4…

MALICIOUS

PDF

75.3 KB Created: 2021-09-14 03:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3454bbd8c372489397027b3e379a454 SHA-1: b2c16b2b4f6c0c658de9ae6fb07d6455adab6a85 SHA-256: 537114b45870dfe4da0b1fcab33b7d7d8dacff1777cf4e8192851be66d854dc9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. Heuristics indicate this PDF is designed to redirect users, with ClamAV identifying it as a phishing trojan. The ML classifier also strongly flagged it as malicious, supporting the conclusion that it is used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=calculator+app+lock+for+android+free+download PDF link annotation
    • https://otoform.com/upload/ckfinder/files/31960803739.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/tajuxedadotago.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/55753344538.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/putotoxazegevere.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/mivamajajorasozo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16130c4e30e534---15227411223.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/wafadigaduwefug.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/xerozibavaxo.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/4126408206.pdfIn PDF document text
    • http://adveotec.com/img/file/mutufudafixumesow.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/borefexorabepen.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/45410975510.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/kizunox.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/74761750826.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309627935f2---gedanokuvemolexu.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/saxuxelibuxujularosodagum.pdfIn PDF document text
    • http://poiskvod.ru/images/file/petebirubupuwomelapadaja.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/63229435290.pdfIn PDF document text
    • https://wsbtitan.com/images/file/nunakapugogubofeza.pdfIn PDF document text
    • http://wjcopy.com/upload/files/kolivuzigak.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/vabilafodufuzowesofapanav.pdfIn PDF document text
    • http://goldia.cz/data/file/83725625108.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/sefubiwel.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_off0000c14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14E 17532 bytes
SHA-256: a00e8a88232ac4bf38977c621a240dc40dda4da8bac888d793aef469237afcf2
font_01_sfnt_off0000eeca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E1 10756 bytes
SHA-256: f387b81cdb9b82d271953238f4a7c69d862da24d3b00cd5d39550f051ace91a4

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