Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7f481c86c7f65e…

MALICIOUS

PDF

78.8 KB Created: 2021-01-31 02:45:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: beeb91a8e7fac9d2b669e8b871d7bde5 SHA-1: 71b38dbee7054c84487ad8426fa78378a9042044 SHA-256: 1e7f481c86c7f65e27ad8545df871f5ef774bf9e1a830007ead73dc30bf1d6e0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it's a PDF generated by wkhtmltopdf, possibly as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/aws?utm_term=pop+art+photo+editor+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409396/normal_5fe6fe7f00a7c.pdfIn PDF document text
    • http://reduslim-official.website/macroeconomics_gregory_mankiw_8th_edition_free_downloadfw4id.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470400/normal_600ff3b5c581e.pdfIn PDF document text
    • http://hookup154.site/yamaha_rx-v477_setup_guideosu61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427793/normal_5fceacf2cfbea.pdfIn PDF document text
    • http://dovamemowiruz.iblogger.org/estrategias_de_aprendizaje_definicion.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457592/normal_5fed0b36492a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490371/normal_60145a706d252.pdfIn PDF document text
    • http://tijoxuxiga.iblogger.org/auto_tune_app_pc_free.pdfIn PDF document text
    • http://electorat.org/23477953702s8nw9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417805/normal_5fea40760de57.pdfIn PDF document text
    • http://healthytrands.com/nixez0rt1g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://kazoverowagodi.epizy.com/vodafone_caller_tune_app.pdfIn PDF document text
    • http://gajovab.epizy.com/renisedu.pdfIn PDF document text
    • http://xofafatererowu.rf.gd/bluestacks_apk_free_for_pc.pdfIn PDF document text
    • http://wixudilasajigil.rf.gd/vobutemuwa.pdfIn PDF document text
    • http://buwumipulufi.epizy.com/lapabujeguba.pdfIn PDF document text
    • http://zifixatef.rf.gd/6852864516.pdfIn PDF document text
    • http://supisaminuwon.rf.gd/filirijupozi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 4920 bytes
SHA-256: fefb0f6c81cab84504b93165c9e83237583d89679dd8f541631404e38e909649
font_01_sfnt_off0000e677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 11592 bytes
SHA-256: 4a47f29382c0f5c757fea37c1f6a3800e54d2a8a42ddf6276c4fa4abe43ce2ae
font_02_sfnt_off00010d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0A 16136 bytes
SHA-256: 62b0478e3bcacaeb9df6fa0984507e722920f7489b4d5e25f45df3fdf1e55086
font_03_sfnt_off00012252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12252 2752 bytes
SHA-256: 11bf571f0af05367446b2020c2f1c6267491649bc48117454eca19867f219dc9

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