Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb6d4162035a7ae…

MALICIOUS

PDF

75.4 KB Created: 2021-04-29 00:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 666c33ddc5e02cfdded9e885c410dcce SHA-1: df3dcc6cc06e3fe5c9ea1a6b3e904ecb06128878 SHA-256: 0fb6d4162035a7ae09dad009b81c7cce22989df420fe0e90b8cde5f2190e9944
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious domains. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs further supports the attack pattern of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=mini+red+hot+dogs PDF link annotation
    • http://losiruwu.66ghz.com/strona_bierna_angielski_wiczenia_past_simple_present_simple.pdfIn PDF document text
    • http://fafasun.iblogger.org/alkenes_11th_std_notes.pdfIn PDF document text
    • http://nipugupaf.22web.org/cambridge_igcse_ict_second_edition_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455894/normal_603ba451c6490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454679/normal_6065f1e30aa42.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/jgIhcVV/pidata.pdfIn PDF document text
    • https://cdn.sqhk.co/kasuvapexal/TPhghfd/sodium_and_chlorine_forming_table_salt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411937/normal_603e6e900f598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501361/normal_604cc7590e16c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454671/normal_5fccd8ba30fe5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454424/normal_5fed42a49a941.pdfIn PDF document text
    • https://cdn.sqhk.co/wokiwife/hfP8njd/cnc_guideways.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469640/normal_6047f9e992558.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490269/normal_5fc9b5851f55f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/katod.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/sivanefux.pdfIn PDF document text
    • http://deniketeza.rf.gd/arcane_mage_dps_guide_8._1._5.pdfIn PDF document text
    • http://pazokidewuwi.rf.gd/daily_cash_book_register_format.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/carnival_of_souls_1998_full_movie.pdfIn PDF document text
    • http://lederelinu.rf.gd/nivewudebegotatazafus.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 4848 bytes
SHA-256: e160ac44e8ee4a99ead4dfc251199cb25f8de20c8405d4e6b88b494dee2e8af3
font_01_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 11588 bytes
SHA-256: 7ef0c78bb3e4e9f01b740dffc275b497ee2e8c1683c0b75c21ffdc72d826c8ec

Open this report in the interactive analyzer, or submit your own file for analysis.