Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc19e77127fcfe97…

MALICIOUS

PDF

40.3 KB Created: 2020-04-26 20:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 27f5a0dabaee6b18a9cef5925c0f3d96 SHA-1: de5458f23f050d92b98023617170e5ed3ea6ed72 SHA-256: dc19e77127fcfe972b3d1b1d185fbf64b0d39aa6e76d81100db82a84cc31c5b3
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution mechanism. The ML_NYX_PDF_MALICIOUS heuristic also strongly indicates malicious intent. No scripts were extracted from this sample, but the sheer volume of external links points to a malicious distribution or SEO poisoning attack.

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://fitnessmanagmentgroupbda.com/uploads/1/3/1/4/131438676/131438676.html#adjective+clauses+exercise+pdf
    • http://decisionanalyticsystems.net/uploads/1/3/1/4/131454699/bukavibuja.pdf
    • http://hinoelle.com/uploads/1/3/1/4/131483185/8021098.pdf
    • http://powerlinkpromo.com/uploads/1/3/0/8/130873839/8159380.pdf
    • http://miloandfin.com/uploads/1/3/1/4/131453623/9b4c2c4f4.pdf
    • http://monocularphotography.com/uploads/1/3/0/5/130539516/2289655.pdf
    • http://carstenwalker.com/uploads/1/3/0/8/130814020/mapofopilu.pdf
    • http://kufambientaciones.com/uploads/1/3/0/7/130775162/migadi.pdf
    • http://alisasapothecurious.com/uploads/1/3/1/3/131378991/vazanezirulalivumemi.pdf
    • http://americaninfousa.net/uploads/1/3/1/4/131406343/99e6980d.pdf
    • http://sethspartanempire.com/uploads/1/3/0/9/130969264/024c8835a79c9a.pdf
    • http://oregonwoodmill.com/uploads/1/3/1/4/131438044/lotumaxivavi_bizoxag_vajuneb.pdf
    • http://ventonconsulting.com/uploads/1/3/0/6/130604125/vuniriw-werafit.pdf
    • http://idealdance.net/uploads/1/3/0/9/130969747/wolutamikovumo.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_off00007345.bin
bce8cfd64812e6e4b9b678275e65bdc0eda13488c6da2db5c3b8131ed687511d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7345 8368 bytes

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