Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0de03f39143ec8…

MALICIOUS

PDF

72.7 KB Created: 2021-03-24 06:08:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ee28cbf9e468d75c2b66c9917c8d8e6b SHA-1: b76590f9a89621f9c4a5311817e35ac85237d381 SHA-256: bd0de03f39143ec886565151faf3c91c98b569bd6a26095185845cb0711a9d05
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/123?utm_term=laravel+ajax+form+autocomplete PDF link annotation
    • http://securitycheckingbrowservkcom.xyz/tolazufizilamuz5wb6q.pdfIn PDF document text
    • http://app-3null.com/falolevadaruvozobaxavit2zon6.pdfIn PDF document text
    • https://feroredo.weebly.com/uploads/1/3/1/3/131379294/tewaxi.pdfIn PDF document text
    • http://fito4ka.xyz/xozisiverakanubufij5ay.pdfIn PDF document text
    • https://mufuwavujove.weebly.com/uploads/1/3/4/0/134042856/wukamasujawabujuru.pdfIn PDF document text
    • https://nelurorinubix.weebly.com/uploads/1/3/1/3/131384252/2270223.pdfIn PDF document text
    • http://vevebopawo.mywebcommunity.org/exercicios_balanceamento_quimico.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/dominos_pizza_allergy_list.pdfIn PDF document text
    • https://romasipunup.weebly.com/uploads/1/3/2/6/132681769/jopukatisirubofolo.pdfIn PDF document text
    • http://tokexal.medianewsonline.com/electronics_projects_free_download.pdfIn PDF document text
    • https://puluzoxaxidu.weebly.com/uploads/1/3/2/6/132683087/ladufewi_timixanuni_nobezedidawizab_wonapak.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://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_2ae7d3b3dab74198af25220a0fb7b2cf.pdf?index=trueIn PDF document text
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_ee1e310884c74527916f5d31ff59eac2.pdf?index=trueIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_e398822fe5844862b3d6b3a751fa50e8.pdf?index=trueIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_85c91ea4593d49bb8677f1cc1a37ae2d.pdf?index=trueIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_ee29b0cb3787408cbf6358f05d916ce8.pdf?index=trueIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_e10637c7985a45d9a9e3926b445d9fa4.pdf?index=trueIn PDF document text
    • http://ranitirunom.myartsonline.com/el_caballo_de_troya_saga_completa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eedefc1-a076-466a-a569-38d662f5bc26/char-broil_tru_infrared_grates_rusting.pdfIn PDF document text
    • https://2571d5ef-7130-409a-b87d-c3fd18a83f30.filesusr.com/ugd/71fc55_c178fccb1dbc4a6094f1d0c014bfd5d2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/291bd679-26af-4e10-baae-b8f02d740955/spanning_tree_protocol_stp_provides_protection_against.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 4856 bytes
SHA-256: 7a6426ab7799a66fc3fe6dc6ae2817cfcc55598d7fd2a8c7f1a897391214b76b
font_01_sfnt_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 10144 bytes
SHA-256: e0089c595abac15dce861b4cf5fb6e0884444f7687ed75c77f5cf729eb17420e
font_02_sfnt_off000106e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E1 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34