Malicious PDF — malware analysis report

Static analysis result for SHA-256 450933791bdb445c…

MALICIOUS

PDF

93.5 KB Created: 2021-04-02 16:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31715c101d8200e35454ea254c3027a8 SHA-1: 95f8aea1fb0474363c43044943d4374aecc96fdc SHA-256: 450933791bdb445ce6b716a42e139a7816467d50920eb5268b641d72505189b5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to benign-looking PDF files, but one primary URL, 'https://lozipotod.ru/award?keyword=revista+epidemiologia+e+servi%25C3%25A7os+de+sa%25C3%25BAde+pdf', is flagged as suspicious. This suggests a link farm or phishing attempt disguised as academic search results. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/award?keyword=revista+epidemiologia+e+servi%25C3%25A7os+de+sa%25C3%25BAde+pdf
    • https://wabelurotetef.weebly.com/uploads/1/3/4/6/134693048/pobeselubunobolosud.pdf
    • https://cdn-cms.f-static.net/uploads/4405179/normal_6024ce6fc1a0e.pdf
    • https://cdn.sqhk.co/veletafi/jgiTjiG/prime_and_composite_numbers_1_to_100_chart.pdf
    • https://cdn-cms.f-static.net/uploads/4389571/normal_5fd9b313bc177.pdf
    • https://cdn.sqhk.co/sutexasav/hg88gfR/bharath_ane_nenu_cinema_songs_telugu.pdf
    • http://vuwiwetidajin.mywebcommunity.org/le_guide_pour_devenir_bilingue_en_anglais.pdf
    • https://beripoxepi.weebly.com/uploads/1/3/5/3/135325525/lisozojimuxikevuvuke.pdf
    • https://cdn.sqhk.co/jarogofef/7jhn7ey/19213111907.pdf
    • https://zunukewonodej.weebly.com/uploads/1/3/1/4/131453615/2343384.pdf
    • http://bewewafip.scienceontheweb.net/pdf_el_juego_de_la_vida_y_como_jugarlo.pdf
    • https://cdn.sqhk.co/xurajalijok/FvS7jcv/easy_crock_pot_drumsticks.pdf
    • http://paxijivatebul.getenjoyment.net/fybcom_business_communication_notes_sem_2.pdf
    • http://gukiduwonaxinef.getenjoyment.net/advertising_media_planning_book.pdf
    • https://cdn.sqhk.co/dorejewibiz/ghigilM/80584726485.pdf
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/2787232.pdf
    • https://cdn-cms.f-static.net/uploads/4405641/normal_601b97ef1f819.pdf
    • https://bufopavebusi.weebly.com/uploads/1/3/4/8/134853568/6371885.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5cacaa20-0e3d-4bc6-801c-5d69560f2474/4205664857.pdf
    • https://b6e49935-6d58-4bde-831f-6e0b746776d3.filesusr.com/ugd/7d321f_99540479f7ce41939512aa686b75508f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1c87a29a-3f17-4835-ba4b-7da2259724ba/a_world_of_ideas_essential_readings_for_college_writers_tenth_edition.pdf
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_c636d3058f1745c38b63832a4a2d9e63.pdf?index=true
    • http://lugimeviguv.myartsonline.com/49749012243.pdf
    • https://uploads.strikinglycdn.com/files/b12cfb0f-23d7-4d41-b61f-5c062ea0d489/chandamama_kathalu_telugu_movie_songs.pdf
    • https://uploads.strikinglycdn.com/files/112ea4e0-7eec-45b8-b04b-6625bd6c2512/gigabokakaruw.pdf
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_74e577f16af64e58b501ff411fc71811.pdf?index=true
    • https://938a05da-450f-421e-a59b-0448473a402a.filesusr.com/ugd/cb5dea_a08a63ff420745cc941fba89799f87d6.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a01.bin
2c4e1a9dd190256130a2e76b0f58d47c184b7d6ea40bc6c1570b91b9f855a0f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A01 5728 bytes
font_01_sfnt_off00013d47.bin
ad0d1bccdfbd372eddf48b8664386673f340d035efa3132c5003a7333a4bf00e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D47 13460 bytes

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