Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f4ddec37a94fc7…

MALICIOUS

PDF

82.6 KB Created: 2021-03-15 02:26:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7df38a9fde6e7a46acc5fa2d73d3057d SHA-1: a9ed94ecf7c13bd9fca3201c51f000ff5d29fc65 SHA-256: f5f4ddec37a94fc73b94e78d64fc955405d79ba3255d5bc28c0f4d154c58e18d
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. One embedded URL, 'https://resalured.ru/wix?keyword=apk+kingroot+5.0.5', is particularly suspicious and likely serves as a distribution point for malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://resalured.ru/wix?keyword=apk+kingroot+5.0.5 PDF link annotation
    • http://manapuzasupin.sportsontheweb.net/romeo_and_juliet_act_3_quizizz.pdfIn PDF document text
    • https://cdn.sqhk.co/mebereserab/hfhjghG/classic_tabletop_arcade_games.pdfIn PDF document text
    • http://jovopomutulilo.medianewsonline.com/nigixexazojutuwajelu.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/hhgjdgj/gimawifemigodebosen.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/86e90c48-17cc-452b-8e22-b39d6d08504a/shark_navigator_dlx_filter_replacement.pdfIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_4a89b333515c424580d87dd2dc87695b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jipowumat/anjaneya_photos_god.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfd48ff7-6ba7-46e9-827c-3eba8bea54cc/jifufiniperelodakop.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_417e19895d9248f598ce3cf5b6b34c8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d07124f5-1156-4d36-8dd5-2961f04858d0/xakidotewozili.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/benabedevoluwabapalura.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/router_keyhole_template.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_4412836820394563af3869e76aa0865c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paropabaru/area_of_composite_figures_worksheet_answers_amazing_mathematics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e35bf0e9-ceeb-4963-a5fb-51517de18daf/greenworks_1500_psi_pressure_washer_replacement_wand.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8633d5fb-f598-4734-8cca-3eae21f4cd55/how_to_adjust_carburetor_on_mtd_lawn_mower.pdfIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_e9e154ada7f24e39ae467a313037e99e.pdf?index=trueIn PDF document text
    • http://bajupigirosinaf.atwebpages.com/kuzemivutijamizaxef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f12203-efb3-4b03-bd12-1644cc752632/free_will_definition_sociology.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9E 6440 bytes
SHA-256: 3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a
font_01_sfnt_off0000fa92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA92 4588 bytes
SHA-256: 8ccfb65fcc395f120b3bc716fa0b8a326f333d4421dbe3866030f452892f63ac
font_02_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 10580 bytes
SHA-256: 0f5d01fff7a3375d9ff45ddbfb38403e0673264df35366964dc7690ca70e0664
font_03_sfnt_off00012e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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