Malicious PDF — malware analysis report

Static analysis result for SHA-256 64ba94f31c2edb66…

MALICIOUS

PDF

70.6 KB Created: 2021-03-13 18:55:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0f671345448eca680b8f92cc0605cbfd SHA-1: 9c692db89256aaea161fd6f7b23f33efef9f77bb SHA-256: 64ba94f31c2edb669be68fc13d7268d2a18246b5b489bcbbc2a5e59ba2e800e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URIs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming operation. The primary malicious URLs identified are https://xajibur.ru/strik?utm_term=d+and+d+dice+tower and http://ladirojenovezoj.mygamesonline.org/97407430166.pdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://xajibur.ru/strik?utm_term=d+and+d+dice+tower PDF link annotation
    • http://ladirojenovezoj.mygamesonline.org/97407430166.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/excelsior_definition_greek.pdfIn PDF document text
    • http://relibafogat.sportsontheweb.net/serumen_obturans_adalah.pdfIn PDF document text
    • http://rumepado.mypressonline.com/rawefowagirazinotejapu.pdfIn PDF document text
    • http://zuzorovix.scienceontheweb.net/donuzutagox.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/tuP2gcM/nbc_sports_apple_tv_cost.pdfIn PDF document text
    • http://linefofaxugedu.mywebcommunity.org/have_we_ever_lost_a_person_in_space_without_suit.pdfIn PDF document text
    • https://cdn.sqhk.co/wamamuli/fLAwxvj/repair_large_hole_in_wood_floor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gevejonitu.onlinewebshop.net/how_to_connect_dishwasher_drain_hose_to_air_gap.pdfIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_29c7adac656947f08c725ff1fb19fb14.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7d2b385-d588-4a75-903e-1c720de8c162/how_do_i_connect_my_hp_laserjet_pro_400_to_wireless_network.pdfIn PDF document text
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_11d8ba049e2d467a9c94a0c65e95deb9.pdf?index=trueIn PDF document text
    • https://063758de-fb2f-4258-809e-b727485bfd5a.filesusr.com/ugd/89cda4_789b41fa0a484b37b240a85145d3115c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bae7b1b-dc4c-45e7-a1ab-6bbd68caf6c1/39973288579.pdfIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_5794668678a4437787b237c7003460e7.pdf?index=trueIn PDF document text
    • https://22520ec4-2132-45a5-98b8-54db1b71d3ea.filesusr.com/ugd/b33b96_d52f103e5da747febd06c3b699c23f29.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae54e310-d78a-4ebd-a386-8ebd55f8126f/gedabapinawatijemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e14d8c8b-3f87-4083-afb6-bbb98b3376e3/robojumawibuxevelukovije.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5411dbce-be3c-4570-8ce0-5c2ca42f7390/best_diet_plan_for_healthy_body.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E7 4812 bytes
SHA-256: f2a051d0ca3b5ef1163acd6e454740179b4fa5308ba316ee2e0746fdba43f860
font_01_sfnt_off0000e668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE668 11104 bytes
SHA-256: 9b5fe3f6a159358d5a1449ff4fe46d87e8c079ca91aff89185ef03bec5808595

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