Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb457a06d113948c…

MALICIOUS

PDF

77.5 KB Created: 2021-03-24 09:06:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5495c20d90a9156ec54325420585a24c SHA-1: a7466ebd4a0fff0985c4e96899c9403f7a4c8c10 SHA-256: eb457a06d113948c4b402e63254f51e12f36450164bc81e4e55322cfa1513794
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with at least one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=what+are+the+three+characteristics+of+civilizations In PDF document text
    • https://cdn.sqhk.co/pixafosabow/nic9SJk/60970256178.pdfIn PDF document text
    • https://cdn.sqhk.co/rorefevobo/emhdifU/coin_pusher_game_locations_near_me.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/how_to_apply_vipassana_meditation.pdfIn PDF document text
    • https://cdn.sqhk.co/fejovuwov/fwBghhi/jumiderubibuxepem.pdfIn PDF document text
    • http://rewita.fun/bernina_1090_bobbins23nxq.pdfIn PDF document text
    • https://cdn.sqhk.co/xataruzepape/g81Sjd6/83658702062.pdfIn PDF document text
    • https://cdn.sqhk.co/viwedanej/diiTgeu/yellow_book_cover_design_template.pdfIn PDF document text
    • http://russianstravel.ru/how_to_search_for_keywords_on_iphone_messagesf8zzc.pdfIn PDF document text
    • https://cdn.sqhk.co/kagofiwavum/jt1gdjf/xopabekereg.pdfIn PDF document text
    • https://cdn.sqhk.co/ranemagesoga/eUPicha/piggy_adventure_roblox_escape.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/70832753203.pdfIn PDF document text
    • http://vamolufu.getenjoyment.net/popawetopurarixopifij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/95b7686b-cf5c-4bf9-9630-4c512b1f4361/maintenance_schedule_toyota_camry_2013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41cb587e-6685-441a-a633-c605acf5d252/hp_laserjet_1536dnf_mfp_inkt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a746dbb1-4605-4e5a-8bf7-2870b9198097/excel_vba_declare_global_array_variable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e0b031-5da0-4ba9-93f3-01614b4cf156/mukegavebax.pdfIn PDF document text
    • http://daximogosamov.myartsonline.com/wupenigutuvujilapojaru.pdfIn PDF document text
    • http://dejibokakar.onlinewebshop.net/wixowaji.pdfIn PDF document text
    • http://kadoxosin.atwebpages.com/murray_24_riding_mower_bagger.pdfIn PDF document text
    • http://sujunutab.atwebpages.com/jamigevebefifelaruzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e634978-bbb0-4c3e-9d53-29b22a178f3c/78026956325.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_off0000f278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 5092 bytes
SHA-256: b1734f85c54e4e1408cf9b506b67000ef958bbd5d37319c598bf33edf27fc332
font_01_sfnt_off000103dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 10800 bytes
SHA-256: 508bfbc12dd40e86e66b14576fc809aa4cd4fb61aa8e22170c829f0ad33fd136

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