Malicious PDF — malware analysis report

Static analysis result for SHA-256 180a2de858ff561d…

MALICIOUS

PDF

72.0 KB Created: 2020-04-10 23:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9ad18afd4301d93e77b53ba9d0d52645 SHA-1: ef6b98112b19b61b4ef19e7bcd1f7c7573e36e0e SHA-256: 180a2de858ff561d7ce99ae4c8bcc6752568a58783ba83be70bc113a55621391
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of numerous URLs points towards a link farm or redirection strategy. No scripts were extracted, but the overall structure suggests a malicious document intended to drive traffic to potentially harmful web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://qualitycareafh.com/uploads/1/3/0/6/130604154/130604154.html#uniden+bct8+discriminator+tap
    • http://brooklynbriton.com/uploads/1/3/1/6/131606227/3333378.pdf
    • http://spokanebirddog.org/uploads/1/3/0/4/130483118/3697830.pdf
    • http://amysamuels.pink/uploads/1/3/0/6/130639121/4401937.pdf
    • http://diamondcrown.org/uploads/1/3/1/3/131398526/bubezusesoz.pdf
    • http://hawkeyegamedesign.com/uploads/1/3/0/5/130539315/fobavadelo.pdf
    • http://bandccleaningservice.com/uploads/1/3/0/5/130540585/2242282.pdf
    • http://geometricsharpeningservices.com/uploads/1/3/1/4/131483197/bejodu.pdf
    • http://jlldenvermultifamily.com/uploads/1/3/0/6/130620758/8a3bb8ffa4.pdf
    • http://morrispackaging-glasgow.com/uploads/1/3/1/4/131406432/gidalo.pdf
    • http://jllbankingforum.com/uploads/1/3/1/3/131380177/jobovo.pdf
    • http://thelazyrussian.com/uploads/1/3/1/4/131437100/mamipalajuzabozuf.pdf
    • http://heathergraef.com/uploads/1/3/0/9/130969853/1239876.pdf
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e757.bin
b57b03b892bd86859e6e292576f4557d78f9b841b22efa22600c61b8217613bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 8980 bytes
font_01_sfnt_off00010960.bin
cfb3357b20fb01955c1e4a0ed568c791e3a97db8f0fbaa18432a833eaa1d19da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 2828 bytes

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