Malicious PDF — malware analysis report

Static analysis result for SHA-256 30e648cfc3cdba6c…

MALICIOUS

PDF

73.5 KB Created: 2021-06-06 00:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b23d20b7063991a70e8c70b18b3f2ac7 SHA-1: e54ec7d5004dc02149086bafba7db94864f77691 SHA-256: 30e648cfc3cdba6c7d904c09d534ad66e45ca0dbbd930553ff02c9dc415bb3bd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

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://catamma.ru/pbw?utm_term=how+to+turn+on+dyson+ball+vacuum PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485149/normal_605fbf262caa2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419623/normal_5fc99a417f4dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389394/normal_5ffc97ee67d5d.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4460686/normal_60b0699bddcbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449769/normal_602b6f05712aa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445321/normal_5febe87b9fb68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_6023142e12c78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425504/normal_6026011ea92d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468537/normal_5fcfe4ec87d0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480895/normal_6012327d133fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389582/normal_606a33ffd817d.pdfIn PDF document text
    • https://galanutix.weebly.com/uploads/1/3/4/5/134591813/butapu.pdfIn PDF document text
    • https://xumulevaz.weebly.com/uploads/1/3/5/3/135348617/momiveru_zegukovafesog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457573/normal_603e401ba5191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379369/normal_5ffb3fc19ec6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380090/normal_60511272c7992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470019/normal_606e267263d2c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lonazak.pbworks.com/f/apprendre_mots_francais_avec_images.pdfIn PDF document text
    • http://nubuzefi.pbworks.com/w/file/fetch/144590661/83436843351.pdfIn PDF document text
    • http://jeselivid.pbworks.com/w/file/fetch/144516465/24078157655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/374cc794-1cb0-4284-9619-ed5ab7c0c88c/how_to_write_cursive_handwriting_capital_z.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43776ded-c707-4eed-bf95-e2e4848e8e31/an_assembly_chart_is_created.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ceaf54-4dd7-4bab-8ab5-c457ed1a5b92/the_developing_person_through_the_lifespan_11th_edition_free.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_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 5440 bytes
SHA-256: 15a9cf9fc6ac5e30bff312d5f80bc61d1a974761d49a5a4de9776079dd5b3b79
font_01_sfnt_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 10264 bytes
SHA-256: 328387538d2555c372273c4279e1516d482f9d6c6fcb1ea6f4469ade95e9ef24