Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a90855b2aa6338…

MALICIOUS

PDF

47.5 KB Created: 2020-05-13 07:02:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 37c91504f603e55559bfc546d2031bb0 SHA-1: 1c882ebf57a84579663edcbf86cdeacb3c3e26e7 SHA-256: 71a90855b2aa6338b471debc3d7a9113d860ec4fec65f9b90fd169f465b0f169
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO spam campaign. The document body text, though partially corrupted, includes a URL that mimics a software download, likely a lure to direct users to malicious or phishing content. The ML classifier strongly flagged this PDF as malicious.

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://komercallc.com/uploads/1/3/0/5/130550910/130550910.html#mathematical+modelling+software+free
    • http://jsnobles.com/uploads/1/3/1/4/131408572/xodasobeserotokikej.pdf
    • http://floridadivision9.org/uploads/1/3/1/4/131437755/xuwimumawifu_xafonelap_vinomatewubede_sulererogifajeb.pdf
    • http://ejoevaultservices.org/uploads/1/3/0/5/130588833/vomuraluraloles.pdf
    • http://thesongstress.com/uploads/1/3/1/3/131380755/sejobekudevu.pdf
    • http://bobflintceramics.com/uploads/1/3/0/7/130739656/mukazafe.pdf
    • http://mdotoffee.com/uploads/1/3/0/5/130548152/67483bd554e1db.pdf
    • http://new-jersey-trucking-accident-lawyers.com/uploads/1/3/0/5/130543032/gegeser-lowarifa-benoj-muvaxu.pdf
    • http://sinkovicspeter.com/uploads/1/3/0/6/130639862/vezixemutitilevusid.pdf
    • http://multiplygroup.store/uploads/1/3/1/3/131384101/viwasajifo.pdf
    • http://kiddieslearninghub.com/uploads/1/3/0/5/130539202/gizinofugarefek.pdf
    • http://powerpartners.info/uploads/1/3/0/3/130313345/gojunebomuw.pdf
    • http://chenangosummerjam.org/uploads/1/3/0/9/130969699/tofotafaj.pdf
    • http://onthejourney.store/uploads/1/3/0/4/130483869/6140165.pdf
    • http://coalesceconsultants.com/uploads/1/3/1/3/131383424/0a40f5e8c.pdf
    • http://athenianci.com/uploads/1/3/0/7/130775902/1835528.pdf
    • http://hannahinstitute.org/uploads/1/3/0/6/130605332/pademumubilaj.pdf
    • http://duncannonag.com/uploads/1/3/0/8/130814874/de7fe0073414a1.pdf
    • http://penkrush.com/uploads/1/3/0/7/130775698/bea6a3cbee0a8.pdf
    • http://www.mat.univie.ac.at/~neum
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078a8.bin
da4ad7b04384b52a06c229ced7f084a0d48d9d435b308cc58d40f1bd5f432388		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A8 10260 bytes
font_01_sfnt_off00009c08.bin
c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C08 16204 bytes

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