Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf366891b92d1e3d…

MALICIOUS

PDF

46.7 KB Created: 2020-06-09 04:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: a30621259afa384be1e3604f2a63111c SHA-1: 5e2c9a00040b0be559230beba7fa5e8c3bedf740 SHA-256: cf366891b92d1e3d6bf7ae762e2c9101083525084bbf38bf42f875dd6debbe1c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The primary URL, http://3xh.undesirable.us/uploads/1/3/0/3/130313183/130313183.html#pass%25C3%25A9+simple+et+imparfait+exercices, is embedded within the document body, suggesting a lure to external content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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 http://3xh.undesirable.us/uploads/1/3/0/3/130313183/130313183.html#pass%25C3%25A9+simple+et+imparfait+exercices PDF link annotation
    • http://dancedietitian.com/uploads/1/3/1/8/131856669/3416700.pdfIn PDF document text
    • http://pleministry.com/uploads/1/3/1/3/131380618/7502378.pdfIn PDF document text
    • http://join.goddessashton.com/uploads/1/3/0/4/130488338/tutanokom.pdfIn PDF document text
    • http://sundancerabbitry.com/uploads/1/3/2/3/132303278/xeduvirawixo.pdfIn PDF document text
    • http://josiebeszant.com/uploads/1/3/0/6/130621296/dozulewen-roxetawifaj.pdfIn PDF document text
    • http://mister5foot18.com/uploads/1/3/0/8/130874565/3a6928.pdfIn PDF document text
    • http://meltinglingerie.com/uploads/1/3/0/4/130488847/c0b2a681276c58c.pdfIn PDF document text
    • http://thenotquitewellproject.com/uploads/1/3/0/6/130639304/mefegotepejeza.pdfIn PDF document text
    • http://tomburchinal.com/uploads/1/3/0/3/130323184/valaduki.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tupuvemom.files.wordpress.com/2020/06/vosirovamoz.pdfIn PDF document text
    • https://zetimoximuti.files.wordpress.com/2020/06/vakafoz.pdfIn PDF document text
    • https://fisajisekik.files.wordpress.com/2020/06/2100580239.pdfIn PDF document text
    • https://megewusebu.files.wordpress.com/2020/06/fegejezikovazodefivit.pdfIn PDF document text
    • https://jadelitikum.files.wordpress.com/2020/06/rejejite.pdfIn PDF document text
    • https://norofila.files.wordpress.com/2020/06/betevegitukekiwekesew.pdfIn PDF document text
    • https://tavatolu.files.wordpress.com/2020/06/dikef.pdfIn PDF document text
    • https://roliwupiv.files.wordpress.com/2020/06/94904978874.pdfIn PDF document text
    • https://saziwiri.files.wordpress.com/2020/06/mexojejufurewuzozufipa.pdfIn PDF document text
    • https://sotarobimubu.files.wordpress.com/2020/06/45984734766.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000657d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x657D 1692 bytes
SHA-256: 71bd27ada0f75a82d9a525bc9e26e68ea5a593cf144a1235911189b296fe57a8
font_01_sfnt_off00006db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DB3 13120 bytes
SHA-256: b2ad96cde21640d4cbeaceb364a553a2d90cb082ff701b85ba4abbe3a881126b
font_02_sfnt_off00009665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9665 16204 bytes
SHA-256: c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449

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