Malicious PDF — malware analysis report

Static analysis result for SHA-256 e894fc3f713ac0d8…

MALICIOUS

PDF

78.6 KB Created: 2021-04-17 05:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a4cde9c2c50452be26f74647fac8145 SHA-1: bed4c9c8124c0cd6856815689d13a27518614c61 SHA-256: e894fc3f713ac0d8bef33e0b3ab7140d733b343fd69c33a96e42a1ee29e2071d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, indicating a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/strik?utm_term=the+heart+of+yoga
    • https://cdn.sqhk.co/visesefider/jdHGmgi/promo_marketing_video_maker.pdf
    • https://cdn.sqhk.co/guwuweri/YMGlii0/idling_to_rule_the_gods_drc_guide.pdf
    • http://zavarivaemvmeste.ru/117288386758dao2.pdf
    • https://cdn.sqhk.co/duxadikoti/kudihij/23640747476.pdf
    • https://cdn.sqhk.co/vedimofaw/hhdjgie/probability_questions_and_answers_on_cards.pdf
    • https://cdn.sqhk.co/womalakifaxa/LjfhjzF/ates_ve_su_2_sabah_oyun_oyna.pdf
    • http://bizbize-yeteriz.org/bavetegalejo1ti5.pdf
    • http://workbykoder.xyz/79476459278k8l1a.pdf
    • http://wei-nmvc.com/wirenoxipajusi7xzln.pdf
    • https://cdn.sqhk.co/totarujined/idHHlie/kazapefaseku.pdf
    • http://distornyup.site/hard_maze_games_printablezverd.pdf
    • https://cdn.sqhk.co/jofutagi/igAiftJ/92611356862.pdf
    • https://cdn.sqhk.co/letareximo/igtdjdo/granny_smith_apple_medium_calories.pdf
    • https://cdn.sqhk.co/wabajevebe/ucjcQGd/royal_chaos_array_guide.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/1a5c0f96-4ca1-4081-8b7b-1e606721ba89/garage_door_opener_keypad_not_working_in_cold_weather.pdf
    • https://uploads.strikinglycdn.com/files/a779e5be-49a6-4529-ba92-9a3f267257cb/miss_peregrine_books_genre.pdf
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_bb79b3cf242d42a7bc52d59b1e1453ac.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8edfc8ec-7c5f-45f7-ab1d-300d9fb2e8f2/robert_anton_wilson_quotes_in_order_to_eat.pdf
    • https://uploads.strikinglycdn.com/files/d13424dc-dfdb-4b2c-8f63-3dc1de43385f/21867510347.pdf
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_7a9ba68714ac472b84e5003e3d9ec92f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ebe9d684-eaba-4542-973f-51f44fb816e6/95280845586.pdf
    • https://uploads.strikinglycdn.com/files/31f02d28-3b72-4dac-b931-429b031ce4bd/machine_learning_for_beginners_book.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec6c.bin
3161bade6473a0f260845f9d89d4dd0512a4c44abfcb30465b689ac5f80bbe8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6C 4504 bytes
font_01_sfnt_off0000fbda.bin
cc7b807435129fda5289920ecee172ebf9d7b7ad1c2cab906bc81da5d02af3d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 10260 bytes
font_02_sfnt_off00011eec.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEC 4324 bytes

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