Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cdae84ad4079ce…

MALICIOUS

PDF

95.7 KB Created: 2021-03-19 19:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 659cdfcddc3d9120d12b9c0e061dd112 SHA-1: d80eaf91cad14a53e923b7162ad2e2e2c0975b10 SHA-256: 78cdae84ad4079ce81d639f31846995bd6bcb668725d77170dd9e3f0b9a649c4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, suggesting a link farm or phishing attempt to direct users to potentially malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to manipulate search results or distribute malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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/123?utm_term=movies++hd+tamil
    • https://cdn.sqhk.co/sewadokoka/heMf6jg/current_diagnosis_and_treatment_infectious_diseases.pdf
    • https://cdn.sqhk.co/dilobowuz/Ahridij/spider_solitaire_game_free_online_without.pdf
    • https://cdn.sqhk.co/lanuniwa/iGi4jjN/simply_piano_by_joytunes_for_pc.pdf
    • http://narixuz.mypressonline.com/english_textbook_for_grade_7.pdf
    • http://bumasujofoj.getenjoyment.net/refoxujipe.pdf
    • http://siviveko.getenjoyment.net/center_pivot_irrigation_system_design.pdf
    • https://cdn.sqhk.co/sofawaju/jckgfii/loophole_in_spanishdict.pdf
    • http://tijudozi.scienceontheweb.net/how_to_heat_my_coleman_hot_tub.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_fbb412954c8c46698b3b5dbfffaccdb2.pdf?index=true
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_5defd0cc39ce4973891b77bb20f83088.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d65d53a6-b5f2-45fe-85a5-f085d81f0496/zezuninabim.pdf
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_d568b0314d1d4ddb91a66f4b6dc3b90b.pdf?index=true
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_ee38deb8ffe74617bdf279b275b22162.pdf?index=true
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_f7038dd5ab514a6c973a25cd46b4729a.pdf?index=true
    • https://1c514d3f-4aca-4c14-a2cc-94ef866bc6c7.filesusr.com/ugd/860217_54cc34f92d4b40d1bf62822a5845947f.pdf?index=true
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_a9df587378be4752aed34caee05dc3d3.pdf?index=true
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_08451ba196b6443a9ff82c4f058f3e81.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3056dc1d-7f76-4bcb-aa94-3952d934c0a7/76104335478.pdf
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_e767352ef47f48678ef5283f551b923d.pdf?index=true
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_060e0c3bd4d54a8a9f3a62d20eda94c6.pdf?index=true
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_5d5ae297155f4d0b97078fa1670ffabe.pdf?index=true
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_c1d54b87d0754f09bde452b6b35ad5db.pdf?index=true
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_32e041a783a74e0c83e139dd6ac1e285.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c4c9172b-7a61-463b-951f-bbbbdb9d9e95/2004_chevy_malibu_lt_v6_for_sale.pdf
    • https://36425c1f-c329-48aa-845d-1f8252cb45c8.filesusr.com/ugd/01d500_0eb00a4546184009b60687976f1d54dd.pdf?index=true
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_ae1d806d4854441bb5022eae1877a65a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/84e4d758-b09a-4e05-842b-ac31f0489acc/vafomusabamojibepasopune.pdf
    • https://uploads.strikinglycdn.com/files/3bbcdbc6-10f0-458a-b858-5026faf50563/how_to_make_easy_chicken_casserole_in_slow_cooker.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011fc3.bin
ab478a903a744f69e7b8920447b43c0cbd304c72fc1ae29d1718779ea565ec84		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11FC3 3572 bytes
font_00_sfnt_off00010ec0.bin
7ea372b3a8ac436508f220b5acde88567a92795c2ecd51855e117195a18c7f10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 5032 bytes
font_02_sfnt_off00012d27.bin
21e08c9e098e8ef01b329287e9efef18d21ee9a274f8fe04589064eb316b9f9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 1712 bytes
font_03_sfnt_off000135ac.bin
b060bd8b801e6fdaa80a07d14b44a0fd977ae58368c0155faaf3f659440826f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135AC 10876 bytes
font_04_sfnt_off00015ab8.bin
6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB8 16164 bytes

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