Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d2a047a2cfa837a…

MALICIOUS

PDF

46.5 KB Created: 2020-04-05 03:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 256aea352d521a8d43a69664ae986bb4 SHA-1: cda28919f1101840afa441645b82dac0cead2ecf SHA-256: 0d2a047a2cfa837a8b99247edc401243d9587f787981b4e4390b6e6ff0408fba
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 other PDF files, suggesting a link farm or redirection mechanism. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a malicious intent. No scripts were extracted, but the structure and numerous external links are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kelbels.org/uploads/1/3/0/6/130639406/130639406.html#ejemplos+de+sustantivos+abstractos+oraciones
    • http://marcantoine.studio/uploads/1/3/1/4/131406804/7154089.pdf
    • http://cre8festival.org/uploads/1/3/0/5/130588657/1247371.pdf
    • http://hallyustage.com/uploads/1/3/0/7/130776720/tojow_javog.pdf
    • http://engits.eu/uploads/1/3/0/6/130620395/6314549.pdf
    • http://beeswim.com/uploads/1/3/1/4/131406453/18be04ffd.pdf
    • http://thefaulknergroupllc.com/uploads/1/3/1/1/131163740/vivupi_tufovidivamoruz_borilorikidog.pdf
    • http://seedtoatree.com/uploads/1/3/0/2/130273893/9452222.pdf
    • http://dreamsadvantage.com/uploads/1/3/0/4/130476112/f2fb534.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_off00008b52.bin
f3c23d4b0bb744f37bc2b67099ef94171dd4df5bb504eef907db8e1410e3ff14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B52 9028 bytes

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