Malicious PDF — malware analysis report

Static analysis result for SHA-256 23280534116d36f1…

MALICIOUS

PDF

37.7 KB Created: 2020-06-20 06:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd17225fde56fceeeac3ea253384d892 SHA-1: 94ba4b9d74fba4f1f52f59e225c1f9824bd07d03 SHA-256: 23280534116d36f16d0c70c96e3f583a77d8f591e1b81fbf4238aa780078335f
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This pattern is indicative of a link farm or SEO manipulation tactic, often used to host or redirect to malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://chosenforbroken.com/uploads/1/3/0/7/130776680/130776680.html#endometriosis+exercise+pain
    • http://mta-sts.mesabimusicaltheatre.com/uploads/1/3/1/0/131070904/tuluge.pdf
    • http://auspoolsandspas.com/uploads/1/3/0/4/130483794/a3b31829.pdf
    • http://nashandcothreads.com/uploads/1/3/0/6/130604996/cb5dab168e6158.pdf
    • http://alianzasvalladolid.com/uploads/1/3/0/7/130739860/dulosupopigezo_xifibevixofafop_xabanirimofoto.pdf
    • http://keyesremodeling.com/uploads/1/3/1/4/131406068/zokevus-bimamapagolo-fawagadunisuniv.pdf
    • http://jaxaluminum.com/uploads/1/3/0/7/130739460/vitopirasonixu.pdf
    • http://loicschumacher.com/uploads/1/3/0/6/130621882/forudeliboligi_wijuxa.pdf
    • http://emilydelbridge.com/uploads/1/3/0/2/130291908/rawox.pdf
    • http://mta-sts.mx.eaglestudent.org/uploads/1/3/0/2/130288301/dea169f40640904.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005781.bin
5de49874489c126464504112ed4706b9d721952c441a47e43e2c28a853aaf6b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5781 5000 bytes
font_01_sfnt_off00006860.bin
d2c0f82f10bf4d7a4df34e0b70f514329a7f260a50e9396da29051160e0e759e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6860 10204 bytes

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