Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6ba12a0ebd2631…

MALICIOUS

PDF

93.3 KB Created: 2021-03-29 11:32:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab63702e72f7a8d0aceac6401a048272 SHA-1: 0009149e86d92e6965327be0793d6127c0fced85 SHA-256: 5c6ba12a0ebd2631b60430172f48e3d4802935f24a92ce69b58051fd68b5cebd
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 likely part of an SEO link farm. The primary URL, 'https://leonvi.ru/award?keyword=ascaridiose+traitement+pdf', suggests a lure related to medical treatment, aiming to attract traffic. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely for SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://leonvi.ru/award?keyword=ascaridiose+traitement+pdf
    • https://cdn-cms.f-static.net/uploads/4402737/normal_60463ca41fec9.pdf
    • https://cdn-cms.f-static.net/uploads/4443292/normal_602ad05f8b83b.pdf
    • https://cdn-cms.f-static.net/uploads/4389370/normal_60349abf8bb5d.pdf
    • https://cdn-cms.f-static.net/uploads/4456985/normal_601403f88bf5b.pdf
    • https://cdn-cms.f-static.net/uploads/4408853/normal_60214f72589e3.pdf
    • https://cdn-cms.f-static.net/uploads/4401985/normal_5fd90d7eed596.pdf
    • https://cdn-cms.f-static.net/uploads/4454682/normal_60225efc61b29.pdf
    • https://static.s123-cdn-static.com/uploads/4458848/normal_5ffe970c85a27.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://b860438a-ced3-4995-86f2-ad9a24e3f15c.filesusr.com/ugd/938eb2_fe845cde0048417cb4c77b5346d4aa74.pdf?index=true
    • https://s3.amazonaws.com/zemunomipazikez/going_home_piano_sheet_music_free.pdf
    • https://uploads.strikinglycdn.com/files/3857a9bf-78c3-4b48-a2d4-403ebee47f94/79085076237.pdf
    • https://uploads.strikinglycdn.com/files/14f0c0c9-dff0-4a64-b18c-ba01a4a91799/51281811563.pdf
    • https://uploads.strikinglycdn.com/files/19bb27cd-5934-4f63-a510-5df9fe953d8d/suwefaj.pdf
    • https://s3.amazonaws.com/xefezesebusu/rukanibovixiketepita.pdf
    • https://uploads.strikinglycdn.com/files/58b91517-68d8-4045-bab3-9bdd94e2ea40/15453937383.pdf
    • https://uploads.strikinglycdn.com/files/5525da72-039b-4d08-b1ba-1fa38cd50982/brother_fax_reset_drum_counter.pdf
    • https://s3.amazonaws.com/ropuba/pidagugok.pdf
    • https://uploads.strikinglycdn.com/files/cb644639-70d2-41e7-aad7-f70293df1772/27182150454.pdf
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_7d2f5390dee6454e9b0990801cdcd829.pdf?index=true
    • https://uploads.strikinglycdn.com/files/accd3d9c-2659-45ca-8aae-2c6dc075c95e/samsung_refrigerator_rs265tdrs_parts.pdf
    • https://uploads.strikinglycdn.com/files/9913f377-0c3d-44c7-b557-102c20ce0d18/safety_devices_at_home_examples.pdf
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_50321a5629314419952adcb6859e457e.pdf?index=true
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_a52cddf5557947e5848f0f8c2a05cdd0.pdf?index=true
    • https://s3.amazonaws.com/dowavelaxam/jetonipifirosoziposi.pdf
    • https://s3.amazonaws.com/lumixi/sivesubetovinonesarawezef.pdf
    • https://ce55c564-0e79-48ac-bd91-a034cff8554b.filesusr.com/ugd/bd1fc0_94ea8dae56af4c54a646c46dbcd115e7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ee3.bin
6680270392af25b18dfd257ae0cd343b5f92b08c2b1388c115ef1f105ab03da3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 5048 bytes
font_01_sfnt_off00012fe4.bin
fe19496c73aec954b1fcc83ad2d0c218ab0fb33218ec5a2029222f9b405afbac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE4 13272 bytes
font_02_sfnt_off000158fe.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158FE 4324 bytes

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