Malicious PDF — malware analysis report

Static analysis result for SHA-256 96bff3da9dd25ce3…

MALICIOUS

PDF

76.7 KB Created: 2021-03-20 22:33:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4644cabb50de40719c780438d0bd9819 SHA-1: e26726a68e87f42bd81302ae2b962b9f4ab48717 SHA-256: 96bff3da9dd25ce39c80a2570fc312d2b77e95e03ca29413c4c09d16e52997c9
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary URL being a potential phishing or malware distribution point. Although no scripts were explicitly extracted, the PDF structure and external link farm heuristics point towards a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://soxebez.ru/award?keyword=a+basic+english+grammar+pdf PDF link annotation
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/sisulexasotovo.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/all_of_me_piano_sheet_easy.pdfIn PDF document text
    • https://kelezisexuva.weebly.com/uploads/1/3/0/7/130739204/papunezotebubo-kumijidi.pdfIn PDF document text
    • http://larijasetejupaz.mypressonline.com/tugawoleva.pdfIn PDF document text
    • https://pafebexazare.weebly.com/uploads/1/3/1/1/131163914/99526f.pdfIn PDF document text
    • http://sukotis.iblogger.org/free_birthday_invitations_with_photo_templates.pdfIn PDF document text
    • http://kulanefimolon.mypressonline.com/diccionario_larousse_descargar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9e67f79-c861-4028-9c9e-c3870fdee2b0/how_to_make_lock_picking_tools.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f27e851d-7d64-44cf-b5aa-85d5191a1a2d/womubamolobekoxavisuw.pdfIn PDF document text
    • https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_a2bb99d743f74125bdeeff1464e85d55.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e93a4504-de6b-4ff6-8d8f-9f19097c6f51/58359124652.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0f9c8f5-2ceb-482f-b977-1059fecc50c2/kivisadezed.pdfIn PDF document text
    • http://nimanexobubibub.onlinewebshop.net/shark_vac_and_steam_mop.pdfIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_ca82c35a513d4490a4fb28c0a6186008.pdf?index=trueIn PDF document text
    • https://2df275fc-a8dd-466e-be95-33fe0afe7bed.filesusr.com/ugd/9b6d1e_c65366959f3b44f5b1d686a875463140.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_0f8cc460c6c64c7a8ae7691c1a696040.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 5700 bytes
SHA-256: d06639ee55b6cabf058ad293001f220162fb054f4afdb8a5a946f3c37091a954
font_01_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 11412 bytes
SHA-256: be21a96ec4c84306898c4345f9a490c9b93800992914a39762d735c2bbbebbbb

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