Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b2658cdd4417de7…

MALICIOUS

PDF

34.5 KB Created: 2020-05-28 04:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbcbdc0d5607339b01b83fd4cccf48cb SHA-1: 1738fef356e2c71b6da42561c47c2145232fffde SHA-256: 9b2658cdd4417de7ee0b717cc53c5b7b9237e7f52ab332d45308dcf60947916d
94 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many of which point to seemingly unrelated PDF documents hosted on various domains. This behavior is characteristic of SEO spam or a phishing campaign designed to drive traffic to malicious or deceptive websites. The ML classifier strongly indicated maliciousness, supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://peakathleticsystems.com/uploads/1/3/0/2/130274291/130274291.html#sa%25C4%259Fl%25C4%25B1k+psikolojisi+ppt+giri%25C5%259F
    • http://maureendickie.com/uploads/1/3/0/5/130538838/1612602.pdf
    • http://chexpros.com/uploads/1/3/1/3/131381881/daddd9c378cbc.pdf
    • http://gardnersyndication.com/uploads/1/3/1/1/131163712/titodele.pdf
    • http://jordandecesare.com/uploads/1/3/0/6/130621213/667829e26d9e8.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_off000059c8.bin
14df4c50990eb084ba18232b2180116d9992fe9075a1b9b612715dec8caff78f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59C8 11800 bytes

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