Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea8116d2d1a5bda6…

MALICIOUS

PDF

84.7 KB Created: 2021-05-10 22:36:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cf0edb2a4a928a27ce0dc1aa01c4fa96 SHA-1: 71d04528d4865a0c0cee414ff7f3c2ab3ccfe42d SHA-256: ea8116d2d1a5bda6bf4ad3d0550e93db0a99e4a25af782d6a32912b742e53cde
126 Risk Score

Malware Insights

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

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 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://nipisod.ru/strik?utm_term=the+interlinear+bible+hebrew-greek-english+%2528english+hebrew+and+greek+edition+pdf%2529 PDF link annotation
    • http://detaxinema.22web.org/altura_68_inch_ceiling_fan_manual.pdfIn PDF document text
    • http://kilunanaged.iblogger.org/vugujilinuwobevaku.pdfIn PDF document text
    • https://cdn.sqhk.co/zupuguvawaj/gfggjbv/nintendo_switch_online_gift_card_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/fheieie/marshall_football_stadium_sections.pdfIn PDF document text
    • https://cdn.sqhk.co/jeposanop/biaJfno/75200559976.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/29563178268.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/how_to_get_a_fine_dining_server_job.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/92cb27bf-366c-4dec-8974-63e8f6b97c5d/49827315042.pdfIn PDF document text
    • http://zikoliduxa.atwebpages.com/commodore_64_computer_compendium.pdfIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_0b113e2909994a1c9102929106a76ef4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd9b169-837e-49d4-9a88-8b7ce0240258/sp_800-145_september_2011_the_nist_definition_of_cloud_computing.pdfIn PDF document text
    • http://wuzorijo.rf.gd/leaf_anatomy_diagram_answers.pdfIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_621686a35b5a4ed99c900be484e2dffa.pdf?index=trueIn PDF document text
    • http://nejimafalun.onlinewebshop.net/uses_of_capsicum_annuum.pdfIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_1f54eb9535b740b281c4be5b0b65c3e4.pdf?index=trueIn PDF document text
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_5c92346bc5cc417193e268df904dfef7.pdf?index=trueIn PDF document text
    • http://likadekax.rf.gd/benedict_anderson_anlisis_sobre_comunidades_imaginadas.pdfIn PDF document text
    • https://d429d46a-6203-486b-8c9d-ede5597e1383.filesusr.com/ugd/419b00_89a1e247a9084cd8ab2636f64216c899.pdf?index=trueIn PDF document text
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_14a23f797ffd46c19ad94d5b6eb1c324.pdf?index=trueIn PDF document text
    • http://baletax.onlinewebshop.net/59228993343.pdfIn PDF document text
    • https://df4002df-ed14-466c-b758-10ced248c840.filesusr.com/ugd/3b03e6_26f6aeadf89643228a1d0b6b32319f02.pdf?index=trueIn 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_off0000fb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB92 5520 bytes
SHA-256: 0e88f5f49c78ce1bd323ec2e7bd82eb91e8b89f34effc9932f3af91801289ae4
font_01_sfnt_off00010e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 11796 bytes
SHA-256: 5039f510a739755e63fef84ad5037b1221c256e93839e144e61104e4832c27da
font_02_sfnt_off00013633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13633 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f