Malicious PDF — malware analysis report

Static analysis result for SHA-256 44241c1e51da0668…

MALICIOUS

PDF

37.5 KB Created: 2020-04-05 04:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 35ac061446ad56f9d03c0b6b91b1c2b3 SHA-1: 75cd731a2406ee71f0b828cb8fa07ea652589130 SHA-256: 44241c1e51da066897292b4c0600cbabe74ae33c5f0bf36de1e3f25e318196bf
94 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to 'Sesion de aprendizaje de educacion fisica primaria 2019' and includes a URL that appears to be part of this link farm. The primary function of this PDF appears to be to redirect users to a multitude of other PDF documents hosted on various domains, likely for SEO spam or to distribute further malicious content.

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://janipepelanov.com/uploads/1/3/1/4/131407760/131407760.html#sesion+de+aprendizaje+de+educacion+fisica+primaria+2019
    • http://sonoranshadows.com/uploads/1/3/0/6/130639856/5692322.pdf
    • http://premiercoastalproperties.net/uploads/1/3/0/5/130539115/bd73c2a39.pdf
    • http://hygienixtextiles.com/uploads/1/3/0/5/130539981/somapafobonopux.pdf
    • http://rwclimatecontrol.com/uploads/1/3/0/3/130313196/nikugevupoxakofisa.pdf
    • http://astransportes-nic.com/uploads/1/3/1/4/131410009/f8475.pdf
    • http://tsc-landstar.com/uploads/1/3/0/9/130969422/zuwor.pdf
    • http://jmarkfunding.com/uploads/1/3/1/3/131379306/josurakaxag_zugegupa_rutesezonox_resedepadezin.pdf
    • http://bluewaveonthebay.com/uploads/1/3/0/8/130874075/zuledesalajovi.pdf
    • http://shadecompanysoco.com/uploads/1/3/0/5/130550982/kebugikazupitaviva.pdf
    • http://finmoorepipes.com/uploads/1/3/0/5/130550834/c8eda3fc0a039e2.pdf
    • http://holdempreciousmetals.org/uploads/1/3/0/4/130476091/jifetuxota_kowunuzuvot.pdf
    • http://pridenet.xyz/uploads/1/3/0/4/130436040/duxezitimofi_seroraxixesuj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006718.bin
5a5048a80ca2af3c1357b90118b1e60e5493c956959f5d77117ae3066890e8c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6718 8816 bytes

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