Malicious PDF — malware analysis report

Static analysis result for SHA-256 b50d7ef7c0254632…

MALICIOUS

PDF

74.2 KB Created: 2021-03-11 17:45:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a5503550ef89147ea889cbca13f92756 SHA-1: 5f9dae9155b3b1444a989381c293414dad003136 SHA-256: b50d7ef7c025463203ae2e587d8e736718f2eebde84b831deb08bd976fa61988
186 Risk Score

Malware Insights

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

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 0.9993

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://ponafet.ru/123?utm_term=batch+file++from+sharepoint PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455174/normal_602e7018f01e4.pdfIn PDF document text
    • http://cabinetsapp.xyz/befiboxubefepa3o5h0.pdfIn PDF document text
    • http://viewcreditscore.info/60192260173hjw5n.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/wakamagirikixalaxos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_602c5f11653e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379473/normal_5fe447b2a538e.pdfIn PDF document text
    • https://gazewowotom.weebly.com/uploads/1/3/4/6/134616189/2249880.pdfIn PDF document text
    • https://totaduwuvib.weebly.com/uploads/1/3/0/9/130969262/ec0d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_6036148c8fe1a.pdfIn PDF document text
    • http://copyrightsupport-ig.com/cqc_reports_outstandingh6kxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403282/normal_6043161424fdb.pdfIn PDF document text
    • https://pedumodab.weebly.com/uploads/1/3/1/6/131637036/3474122.pdfIn PDF document text
    • http://igcopyrightforhelps.com/52115825038p6vga.pdfIn PDF document text
    • http://formblckr1.xyz/hungry_shark_game_download_hackjsmsh.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/2c62064f-b078-4f4c-a4f9-d0268c9d4595/systems_engineering_principles_and_practice_second_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc6e918-8947-4272-bf3e-753181ff774e/winchester_model_94_rear_sight_adjustment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7101430-046d-4e25-944c-8871b5305e3d/how_to_process_medical_insurance_claims.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/neramo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb3cfb7-9e7c-472e-8268-035d3fe31396/plantronics_legend_earpiece_replacement.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/embroidery_fonts_bx_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/062637ca-87e6-41f5-b896-ecb487e1e3a7/fujifilm_finepix_s8600_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/wintercroft_mask_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af36f483-6e4a-4ae9-a663-ddb98cc86bcb/11820177658.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_off0000e5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 5304 bytes
SHA-256: 2d2c4ee7d83f0f8953976a3d982fc804344d3304fe876379d575d2822c863272
font_01_sfnt_off0000f791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF791 10556 bytes
SHA-256: 26af8eb214f92b845ced7ad76d63caa5cac6c2dfce02b0e9b910054ca9121759