Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbf3ceb095fcf21…

MALICIOUS

PDF

92.3 KB Created: 2021-02-17 09:14:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b4595932c599d148c7b35e3846baff87 SHA-1: b02f24e86824d4aae47acaeb7cf7a2a2ba9fad96 SHA-256: dcbf3ceb095fcf21491307b07f7d7dcd28f05b20aa81d64848186ea98b4ec497
66 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external links and the PDF structure indicate a likely attempt to lead the user to a compromised or malicious site for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://bologen.ru/strik?utm_term=dbx+driverack+px+service+manual PDF link annotation
    • https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/6096922.pdfIn PDF document text
    • https://sajakuvidosub.weebly.com/uploads/1/3/4/4/134496924/43c17b8768a60.pdfIn PDF document text
    • https://lojavexir.weebly.com/uploads/1/3/5/9/135963097/3219452.pdfIn PDF document text
    • http://alcozerox.com/lopotoboquoc7.pdfIn PDF document text
    • http://xusonawifofi.iblogger.org/92858379656.pdfIn PDF document text
    • https://valodoxajub.weebly.com/uploads/1/3/4/4/134435871/351e4115.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
    • http://kukatunudivolu.epizy.com/klasifikasi_tanaman_anting-_anting.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/68703325804.pdfIn PDF document text
    • http://povalimokuwov.rf.gd/dreamweaver_for_ubuntu_14._04.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/tetaka.pdfIn PDF document text
    • http://vezuzatutuxi.epizy.com/peduwisubatuduvekedapeg.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/guideline_on_immunogenicity_assessment_of_therapeutic_proteins.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 5240 bytes
SHA-256: 8bb22612f16efa475697abde8f601b90abe08cb96da8515c1527db51e5ff7854
font_01_sfnt_off0001279d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279D 15340 bytes
SHA-256: 635de289015f5059a4c36730d74bcc0ee2e401a9cc5dfb41d46d7e078f432b6b
font_02_sfnt_off00015659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15659 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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