Malicious PDF — malware analysis report

Static analysis result for SHA-256 135f946ab9129a53…

MALICIOUS

PDF

35.6 KB Created: 2020-03-29 11:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2d74dd9426ee8e39a61ab9272eb93be2 SHA-1: 0daa0c79e4961c03e9d71cc597cdb723d51f1319 SHA-256: 135f946ab9129a537206ae0501deaad0313764cc1321fa17f94ea30d3351fd42
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains URLs that point to other PDF files hosted on various domains. This suggests a link-farming or content-distribution scheme, likely intended to manipulate search engine rankings or to serve as a distribution point for 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://socalasta.voyagerwebsites.com/uploads/1/3/0/5/130589442/130589442.html#introduction+to+econometrics+solutions+3rd+edition
    • http://pridetoprisonbook.com/uploads/1/3/0/9/130969944/e498fc.pdf
    • http://attunedreach.com/uploads/1/3/0/6/130621628/8456f2e659984e.pdf
    • http://noslipgrip.net/uploads/1/3/0/4/130476403/953922.pdf
    • http://rainsformsea.com/uploads/1/3/0/4/130436354/5fc9ce132ad575.pdf
    • http://trikli.com/uploads/1/3/0/5/130540083/822e9e9d089dfa.pdf
    • http://sabstore4u.net/uploads/1/3/1/3/131398024/kenawewusakalaz-mosetube-tozoxebul.pdf
    • http://baddogcrafts.com/uploads/1/3/0/6/130604314/5203038.pdf
    • http://ctlcasualty.com/uploads/1/3/0/2/130289476/9375125703f316c.pdf
    • http://deepculture.clothing/uploads/1/3/0/4/130483765/rijugomuvisus.pdf
    • http://tradeoutfitting.com/uploads/1/3/0/9/130969339/befel-jemavatot.pdf
    • http://kingdomwealthcreatorsunite.com/uploads/1/3/0/3/130313494/losorej_lufurixabiwin.pdf
    • http://andyfonyemem.com/uploads/1/3/0/6/130603803/3766130.pdf
    • http://brsdentistry.net/uploads/1/3/0/5/130544447/vijinavuwumesoliju.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_off000058ca.bin
c8f4d558cf4bc0df3dbd5a9ea423d1b58e36407516577d3ed47623a0cb1e19a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58CA 7220 bytes
font_01_sfnt_off00007566.bin
bb66d78edca8aa75a8db461931e44ad6eab12e4cd439df836d92d13c6ef6c22d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7566 2668 bytes

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