Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8da19af9b71a84a…

MALICIOUS

PDF

70.0 KB Created: 2021-03-18 10:19:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bcdeb9992830c37c7aea3f4f67c6f568 SHA-1: 422a3119bb5894dd48827ee1c2b4a81ecb95f2ab SHA-256: d8da19af9b71a84a870fa4f4d03f3f923d91dc79944558337454a86fda00b51d
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple external URIs, with a primary suspicious URL pointing to a domain associated with keyword-based redirection. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting a phishing or malicious content delivery vector. The presence of numerous links to disposable hosting and link farms indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jottigo.ru/wix?keyword=the+new+sex+bible+pdf+download PDF link annotation
    • https://cdn.sqhk.co/xibetevoxaj/hiicgjN/crafty_crab_seafood_alexandria.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_6022d7c292970.pdfIn PDF document text
    • https://cdn.sqhk.co/jujejorule/bn3fhaK/64511748906.pdfIn PDF document text
    • http://fojowufuzuno.22web.org/59959437066.pdfIn PDF document text
    • https://zesalefol.weebly.com/uploads/1/3/5/9/135994098/sinobov_fotusezobis_porux.pdfIn PDF document text
    • https://kilizalulalikog.weebly.com/uploads/1/3/0/9/130969980/1964732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466367/normal_60248abb469f2.pdfIn PDF document text
    • https://zulazuxalumino.weebly.com/uploads/1/3/1/6/131606396/xefuxed_xaxizisifaz_fevavu_lumekepijun.pdfIn PDF document text
    • https://wabodaji.weebly.com/uploads/1/3/2/6/132681772/sowosaxozebokafuta.pdfIn PDF document text
    • http://zodoworusa.22web.org/dojadotufedixisafokoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462036/normal_60161db136cf2.pdfIn PDF document text
    • https://tilemutafadat.weebly.com/uploads/1/3/1/8/131856023/vanideludujiza_jufawulajixunes.pdfIn PDF document text
    • https://zupuluduwiwafop.weebly.com/uploads/1/3/2/6/132681460/e22dc255486da4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380070/normal_604b2cb8c21d8.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://tewewib.rf.gd/chrome_plugins_viewer_disable.pdfIn PDF document text
    • http://vamuxusonepuf.rf.gd/famoj.pdfIn PDF document text
    • http://kejefutipetube.epizy.com/dirty_pretty_things_book_review.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_off0000c8b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B6 4988 bytes
SHA-256: abcf89e5a5986d7491f79ac738809d2edd5c9113478b41ba34c895b91a4c46c8
font_01_sfnt_off0000d9ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AB 10440 bytes
SHA-256: b311e20f0da728641c2740112687608f9b2f55e0ca456b7c8f998fd774bb7478
font_02_sfnt_off0000fd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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