Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cda2a506f90db5…

MALICIOUS

PDF

37.2 KB Created: 2020-04-05 12:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2ce94ece16b6cce02b370981b2461072 SHA-1: 4a23a203eabdf18898ec3fe5b67b987c7a8e5116 SHA-256: 18cda2a506f90db52b8288b720a10bf805f357cc51e0f8af5b5eca0a55df746f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-9201257-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9201257-0
  • 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://ruthiesgiftsandthings.net/uploads/1/3/0/5/130590777/130590777.html#integer+word+problems+grade+6+with+solution
    • http://doublebloomcreations.com/uploads/1/3/1/4/131408397/9033720.pdf
    • http://crenuallc.com/uploads/1/3/1/4/131406817/880bc58c0.pdf
    • http://esgeneralconstruction.com/uploads/1/3/0/4/130490643/dc4ce29656016.pdf
    • http://environcards.org/uploads/1/3/0/6/130620940/7991733.pdf
    • http://nativenationarts.com/uploads/1/3/0/3/130323957/8246642.pdf
    • http://icis-bad-woerishofen.com/uploads/1/3/1/3/131382470/sidola.pdf
    • http://thepremierlounge.com/uploads/1/3/0/2/130291908/1494154.pdf
    • http://blemsandbargains.com/uploads/1/3/0/5/130590456/69f3226.pdf
    • http://mountain2river.us/uploads/1/3/0/8/130874113/fuminadiromujubuj.pdf
    • http://gholmeshelps.com/uploads/1/3/0/7/130776078/buxexogawevo.pdf
    • http://kikoglobalpublicidade.com/uploads/1/3/0/7/130738730/xogosefigi-mubikudok-xalonewapisu.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_off000066b9.bin
e12db2bba9e9e30802bfa30c9a8ba4359dffe0d11a7e2895be0334db2109df14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B9 8536 bytes

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