Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ac499495523b07…

MALICIOUS

PDF

40.7 KB Created: 2020-03-21 13:13:32 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 117785613489c4b54c8f2472aa9360c5 SHA-1: dedacb164c65c0528f90af8599d09219d3f14715 SHA-256: 48ac499495523b07ecd0837c595974e2c719c65ff5ae443889d622ff1a3bf8ea
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains a URL that points to an external HTML page and numerous other PDF links. This suggests the document is designed to redirect users to a network of websites, likely for SEO spam or to host 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://snjconstruction.org/uploads/1/3/0/6/130639091/130639091.html#cuales+son+los+niveles+de+organizacion+interna+de+los+seres+vivos+wikipedia
    • http://yogamamacb.com/uploads/1/3/0/7/130775446/dukur_mutofa_kujisojitupob_rilujemumew.pdf
    • http://www.feast512.com/uploads/1/3/0/6/130604136/rexejilef_mudaboju_duxuteten.pdf
    • http://mouthdoctor.net/uploads/1/3/0/4/130476557/sowop_menixovopopal_tidurezoreruze_wewapusubupev.pdf
    • http://sakhalinnaturetours.com/uploads/1/3/0/6/130604508/a3fe881095ff.pdf
    • http://hrsolutionsbytlg.com/uploads/1/3/0/2/130289663/4042c3ba7b057.pdf
    • http://www.padoute.com/uploads/1/3/0/5/130550970/fabetupepotiker-dagafonunemuj-jakibufegemawuw.pdf
    • http://checklistdigital.com/uploads/1/3/0/4/130488217/10caf7750.pdf
    • http://mail.geminilift.com/uploads/1/3/0/7/130775622/fdcf9.pdf
    • http://bquban.com/uploads/1/3/0/5/130539886/5871893.pdf
    • http://quvr.us/uploads/1/3/0/6/130639856/42c90a90df.pdf
    • http://unique1andonly.com/uploads/1/3/0/7/130776312/fowaduximiwor.pdf
    • http://centralrefrigerationservice.com/uploads/1/3/0/5/130550744/sukerofaruzis.pdf
    • http://krtucker.com/uploads/1/3/0/7/130740025/2bd4e61ec2eda6.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_off0000733e.bin
fe70befde49ced915563f611afc0f9594e3ec1b3c268ed048322038dbaf5c203		 pdf-font-stream PDF embedded font (sfnt) at offset 0x733E 8824 bytes

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