Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a4c5b4a6954103…

MALICIOUS

PDF

93.5 KB Created: 2021-06-11 10:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: bbd8ba3c81ecfae126ea102b1646b7dd SHA-1: 68236b06a154f49d43ae3b59dc5d2b21c6c17018 SHA-256: 04a4c5b4a69541037c8c59f360e636750e78ffe4d20f9f184402f04247db9dcc
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 hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the PDF's structure, which includes a link farm, points towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nomylo.ru/pbw?utm_term=bubble+shooter+old+game PDF link annotation
    • https://degupapaji.weebly.com/uploads/1/3/0/8/130814014/gemodapuzabuwogaxo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458826/normal_603bab9902a3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_601520b538293.pdfIn PDF document text
    • https://kukaweferoba.weebly.com/uploads/1/3/4/7/134754127/a2aa1c03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412396/normal_60495ec0e977c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477615/normal_604992256d8ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446782/normal_5fcb7606c8587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498834/normal_6056701d3c729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481518/normal_60ba78ec2ed50.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499629/normal_6007b1df3b83a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404515/normal_6003f47c4a5eb.pdfIn PDF document text
    • https://foziletixe.weebly.com/uploads/1/3/4/8/134868526/besaworinaj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462352/normal_5fc813c12347a.pdfIn PDF document text
    • https://subifegeriw.weebly.com/uploads/1/3/5/3/135348524/537862.pdfIn PDF document text
    • https://jefaganogebe.weebly.com/uploads/1/3/1/4/131437435/4c5334121.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/514e3167-1cf1-427d-af27-f26b22cbd425/les_miserables_character_list_musical.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2106e03-5c64-4d69-a611-a1f12e492390/schwinn_230_recumbent_bike_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd82b72-66cf-494f-abe0-82e390a51fa9/how_to_use_a_tasco_luminova_telescope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97c56ae5-6a87-41d5-8f24-4830773af1a4/tu_risa_pablo_neruda_figuras_literarias.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba0a1d4-fef9-4e11-8460-472a7f133044/classic_horror_short_stories_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/877b2cba-5819-4148-8820-82ef1499a1a8/citizen_skyhawk_limited_edition_blue_angels.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_off00013210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13210 5428 bytes
SHA-256: ae074eb45ea26b76b68f5f33b21434d5ae8bad39d37c8bf0c5322b4ae7fc1054
font_01_sfnt_off00014451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14451 10732 bytes
SHA-256: 13740ae7f7722b51f92669e7ff2a3b6e5ed8f34010e69820635fae9a826a5144