Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc95e0a402a48383…

MALICIOUS

PDF

87.7 KB Created: 2021-03-10 02:19:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 53a54bcb841d66e9e33e0cf8bfaefaba SHA-1: 9f31d66f02af6375c25765fb41fc505e500d8519 SHA-256: dc95e0a402a4838301f8572344f57b17b6f78ba7b59f99ab80f95e2923d9dd0a
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 unknown or suspicious domains, indicating a likely attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan delivery mechanism. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely leveraging T1059.007 if JavaScript was present but not explicitly carved.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/award?keyword=proyecto+techos+verdes+pdf PDF link annotation
    • http://xesapuwax.mywebcommunity.org/seforuzaxigon.pdfIn PDF document text
    • http://vinnipoh.fun/47618150890y61os.pdfIn PDF document text
    • http://salestore.pro/is_data_science_and_engineering_degree6t8s6.pdfIn PDF document text
    • http://usesol.xyz/layers_of_the_earth_worksheet_4th_gradez3saa.pdfIn PDF document text
    • https://cdn.sqhk.co/mojikeke/jxiioWm/31050016778.pdfIn PDF document text
    • http://lishop.site/phoenix_lol_sheet_musicrzcpv.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/the_school_donald_barthelme_setting.pdfIn PDF document text
    • http://tugokutuli.scienceontheweb.net/kadopesuvamaloguxi.pdfIn PDF document text
    • http://bagesopabiwub.scienceontheweb.net/ziwanuvodu.pdfIn PDF document text
    • http://sakhavto.ru/how_to_calibrate_infrared_thermometer_model_qy-ewq-01fto8o.pdfIn PDF document text
    • http://busurman.space/free_online_auto_tune_recorder_nosi9qt.pdfIn PDF document text
    • https://cdn.sqhk.co/pitekofotada/4alI7iC/best_rock_songs_of_the_2000s_youtube.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
    • https://uploads.strikinglycdn.com/files/164bb9ba-8972-4d86-8de8-1c9e6d7a7cc8/omron_healthcare_7_series_wrist_monitor_bp652n.pdfIn PDF document text
    • https://51bf459c-6b46-41b0-863f-532cf8a77e0d.filesusr.com/ugd/2eedf1_5939bd9fe86d4b7fbb7d34fa6d6d7724.pdf?index=trueIn PDF document text
    • https://5b2b9875-3923-4577-9ef6-0527498c95e7.filesusr.com/ugd/4e6dd5_87268cc20849467cbe62e1f61a0d4baf.pdf?index=trueIn PDF document text
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_b25ff580bf01483ea65e50769a87865f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25dc5d9-9b0c-4ef1-a260-316186a30162/pasijuwaxodurukunibaduvuz.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_off0001093c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093C 4796 bytes
SHA-256: 211cb192b595885d29d7bd4519a57232f30db5caf88e9efe64783996129a4c5a
font_01_sfnt_off000119ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AC 12544 bytes
SHA-256: 73f752c3b795b22244621a64ed7f78dabf5beab6448aaa4e7e9d169339a7a375
font_02_sfnt_off0001419e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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