Malicious PDF — malware analysis report

Static analysis result for SHA-256 40f114618660c9c2…

MALICIOUS

PDF

73.7 KB Created: 2021-03-04 16:19:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cea985120ae50536239af3d37318923d SHA-1: bb5c2e665c8edd0c7b221abb385bb1e9fe1ffd21 SHA-256: 40f114618660c9c2917d0dae4c2de2da9a26bb3f8e3811977e6ca9238fbbafbf
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically `https://dafemum.ru/award?keyword=how+to+align+an+ezgo+golf+cart`. The document's structure and embedded links suggest a phishing or scam attempt, aiming to redirect users to potentially harmful websites. The ML classifier and ClamAV detection strongly indicate malicious intent.

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
  • 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/award?keyword=how+to+align+an+ezgo+golf+cart In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370059/normal_5fd67d3185224.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420260/normal_5fc7ffad0a350.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/omb_circular_a-87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468274/normal_5feefd5865d97.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/8iidelX/served_meaning_in_marathi.pdfIn PDF document text
    • https://cdn.sqhk.co/jufebarur/cyiiiav/xojunapenojilevo.pdfIn PDF document text
    • http://gamukanemafutu.mywebcommunity.org/how_to_connect_a_bose_surround_sound_system_to_tv.pdfIn PDF document text
    • http://katipef.medianewsonline.com/printable_balderdash_cards.pdfIn PDF document text
    • https://cdn.sqhk.co/tedalome/hjyWsgc/memimamoxelatezobizadabe.pdfIn PDF document text
    • https://cdn.sqhk.co/teganipuputu/pjhhjja/easy_chocolate_cake_recipe_no_bake.pdfIn PDF document text
    • https://cdn.sqhk.co/nazujovo/I79hdhd/weight_room_circuit_training_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460466/normal_6010def089fa2.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/a4ba0fcc-570f-4b78-be4c-9ea5a303fd1b/what_is_the_most_complex_sql_query.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/184c3d55-fcbe-4a6b-bca6-e72cd90340c9/navy_eval_template_word.pdfIn PDF document text
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_e82a1e5cf2fe407ab7612313c7d8a8fa.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_e28c9b6aebf34a9292de979f211f2822.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad11c0ba-83d3-43f2-9ce8-0c160511746a/how_does_a_lion_protect_itself_from_danger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ef185b-fa5c-4dfe-8665-203091509bf1/what_is_the_central_theme_of_the_cask_of_amontillado.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_9d01818e4e3249238afc7f5066e7fc4a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ed0f6ea-c4a3-44a4-ab2d-fcc9f515fd89/54052285715.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d7f54d0-0e52-40ea-8ae6-c02b2a0dcbdd/white_outdoor_christmas_tree_with_colored_lights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aec890e5-9b13-4c7d-8492-c8331298087b/download_god_chasers_by_tommy_tenney.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_off0000e51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 4976 bytes
SHA-256: 8fecd91c57ee482911449a916f11317c1118d73d3563101c5294a4a70527e3d0
font_01_sfnt_off0000f640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF640 10336 bytes
SHA-256: d261af0ef6f4936f37902de24f940694538b7330a87773a55dd6d06f8b6cee09