Malicious PDF — malware analysis report

Static analysis result for SHA-256 e511591ac4ebb84f…

MALICIOUS

PDF

37.5 KB Created: 2020-03-29 22:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 38685a1821e37eb42c8a59a3611a658e SHA-1: b4a9c0b34a2dd32370eb412161cc22c4d47a7a2f SHA-256: e511591ac4ebb84f9f9369b80c0c9daeeaa964070e33864cd8e1224aa9fa3a61
94 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, contains a URL that appears to be a lure for 'molarity molality and dilution worksheet answers'. This suggests the PDF is designed to redirect users to potentially malicious websites, likely for phishing or malware distribution. No scripts were extracted from this sample.

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://74-123-78-145.mgwnet.com/uploads/1/3/0/3/130379509/130379509.html#molarity+molality+and+dilution+worksheet+answers
    • http://newearthconnections.com/uploads/1/3/0/4/130488741/2284988.pdf
    • http://pilarenergy.com/uploads/1/3/0/3/130379210/5759621.pdf
    • http://www.genpromotion.eu/uploads/1/3/0/5/130551739/najuzekolijedi.pdf
    • http://layersofveronica.com/uploads/1/3/0/8/130814581/pufakizufazisodusira.pdf
    • http://newhealtheconomics.com/uploads/1/3/0/3/130324440/5c947d62b.pdf
    • http://beautythegeek.com/uploads/1/3/0/6/130605080/vulov-gujiralukoriri.pdf
    • http://duvalcareers.com/uploads/1/3/0/2/130289154/36a8ae5dab3dbf5.pdf
    • http://spyingheart.com/uploads/1/3/0/6/130620874/giveduvuza-pabonoz.pdf
    • http://szcherubin.pl/uploads/1/3/0/3/130379293/zinupawi.pdf
    • http://shawplist.com/uploads/1/3/0/5/130543264/zamabakizita-sofula-todelosigopagid.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_off00006a7d.bin
9a6af7e23430eb8ff3ac572a1575609cb46701004e866442fd4148f08a23c155		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7D 7928 bytes

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