Malicious PDF — malware analysis report

Static analysis result for SHA-256 116a8698c25e40f9…

MALICIOUS

PDF

82.0 KB Created: 2021-03-18 11:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ccd62bea22c62831ae40f9bae169e2b2 SHA-1: d23b763f19f0fc61f8360891bdff2f0979628a70 SHA-256: 116a8698c25e40f93dd990879f1d6ab5415c646ebe9933d16acb4d2cf19c8eb4
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high-confidence ML detection and a critical ClamAV detection, indicating malicious intent. The 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic and the embedded URL point to a phishing lure, likely disguised as a download or information link. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a search term, suggesting it was generated to appear as a search result or informational page to trick users into clicking the malicious link.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/aws?utm_term=element+55+inch+tv+weight PDF link annotation
    • https://tugalebuwe.weebly.com/uploads/1/3/4/0/134012885/fugev.pdfIn PDF document text
    • https://rinezafuwokof.weebly.com/uploads/1/3/1/4/131437641/wenabow-lunozawupe-mumuvubebi.pdfIn PDF document text
    • http://bathforlegs.xyz/maquina_de_coser_singer_316_g_manualwaav8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450256/normal_6002a06215cb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458827/normal_600e4dd03f191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489441/normal_5fe3f2d8e68b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388163/normal_5fc834e0e770f.pdfIn PDF document text
    • http://pitushok.fun/lofixanutotovabekefaxuna2aplw.pdfIn PDF document text
    • http://gevazuvunurodum.22web.org/best_childrens_bedtime_stories.pdfIn PDF document text
    • https://relodigiluburem.weebly.com/uploads/1/3/2/6/132681887/lituwabetobiwibop.pdfIn PDF document text
    • https://wugepugozufov.weebly.com/uploads/1/3/4/7/134744675/1e91236cd3a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483337/normal_6008d6f7ac237.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gazisemodab.epizy.com/geometric_font_family_free.pdfIn PDF document text
    • http://mebexadesojixip.rf.gd/itunes_free_for_pc.pdfIn PDF document text
    • http://gerinidud.epizy.com/25722383789.pdfIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_021c16ce77d74240adc554e5427a5222.pdf?index=trueIn PDF document text
    • http://tubaduk.epizy.com/70347305499.pdfIn PDF document text
    • http://namerunu.rf.gd/mechanical_reasoning_practice_test.pdfIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_9a943d5566024a2babd9bec8ad20ebc9.pdf?index=trueIn PDF document text
    • http://julizut.rf.gd/zuzesifapopubizinag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68E 4640 bytes
SHA-256: 944bd1e797ad4ebb62e5202ac5104cd0dacbfc884c44a6f066c5c5041d269703
font_01_sfnt_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 11348 bytes
SHA-256: cf8e36543f6c783649f32879f7cc3fba41de4660a864e78eda2e713f2d1b62a4
font_02_sfnt_off00012cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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