Malicious PDF — malware analysis report

Static analysis result for SHA-256 516831932641db45…

MALICIOUS

PDF

34.1 KB Created: 2020-05-30 21:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f66c525ccb0da818ee30c9389de049a9 SHA-1: 9c0387d2e22c65a741fe74e3804ea751c96176f9 SHA-256: 516831932641db459d2f974a46cb2350a89bd7376252972b52cbfa4293c43b1d
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The document body, though heavily obfuscated, contains text related to 'Edmodo para estudiantes' and references the wkhtmltopdf tool, suggesting a lure to educational content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous SEO-like links indicates a potential attempt to drive traffic to malicious sites or host further malicious content. The primary attack pattern involves social engineering through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://devs.stefanaarnio.com/uploads/1/3/1/4/131408178/131408178.html#edmodo+para+estudiantes
    • http://suezesaffordablephotography.com/uploads/1/3/0/7/130776247/pegipojep.pdf
    • http://tugfordogs.com/uploads/1/3/1/4/131482833/4317951.pdf
    • http://traumallamas.com/uploads/1/3/1/1/131164471/24340a074fe4753.pdf
    • http://southerncrossgrounds.com/uploads/1/3/1/1/131164460/5946727.pdf
    • http://geminimines.com/uploads/1/3/0/5/130551198/jejuxube_nadisel_punenibopuza_rufogikapulasap.pdf
    • http://originalmailboxcompany.com/uploads/1/3/0/7/130740340/40654ab4800186.pdf
    • http://rhphire.com/uploads/1/3/0/6/130639236/zelawafoxuroro_fodawoxadal.pdf
    • http://luelly.com/uploads/1/3/0/5/130551067/9509645.pdf
    • http://ns2.whatshouldieattoday.org/uploads/1/3/0/6/130621411/81d5f3e.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_off0000596b.bin
e7881f5800756efb56b34bc91099efe7eb803a8a712286d5e6c87d5210ab2f60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x596B 10732 bytes

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