Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d18a254db66fbb1…

MALICIOUS

PDF

37.2 KB Created: 2020-04-09 15:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dc760aa8d4741c7f80a897fd4df4ac8c SHA-1: 38380bb6ef5781a005e602e3eb1b04c4de86b232 SHA-256: 9d18a254db66fbb17da50f8092a783451c7364ee4f7fe3adb678173e0d771353
96 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF documents hosted on various domains. The document body, though partially corrupted, contains text suggesting a lure related to 'matematicas sexto grado pdf', likely intended to trick users into visiting these external links. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent behind the link distribution.

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://iniflashndefense.com/uploads/1/3/0/6/130622076/130622076.html#matematicas+sexto+grado+pdf
    • http://vedvalmiki.com/uploads/1/3/0/7/130775741/886210.pdf
    • http://mk-contractor.com/uploads/1/3/0/6/130621281/mosobusunegojonitiku.pdf
    • http://3bellsartisans.com/uploads/1/3/0/5/130588437/895779c24.pdf
    • http://coloradomongols.org/uploads/1/3/0/8/130874513/c86448d.pdf
    • http://locowebsite.com/uploads/1/3/1/4/131483234/a463b05fb.pdf
    • http://kennedy-edwards.com/uploads/1/3/0/4/130483373/mijubafe_gibomilaroxuva.pdf
    • http://sqftesthree.com/uploads/1/3/1/1/131163514/6215724.pdf
    • http://merakidestinationmanagement.com/uploads/1/3/0/3/130324236/5a177750.pdf
    • http://marinafreire.com/uploads/1/3/0/4/130488244/ba5329eeb93.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_off00006707.bin
16e872460035c9a0bc7a30fd94f9aabcabe2da599be122ea3e2f99505a16c20f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6707 8688 bytes

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